Question: Where were Poland's most valuable resources located?
About the article "Invasion of Poland", section "Polish defence plan".

Candidate passages:
Prior to 584 CY, Geoff's most valuable resources were fur, wool, copper, silver, gold, timber, and gemstones. 
Polish culture during World War II was suppressed by the occupying powers of Nazi Germany and the Soviet Union, both of whom were hostile to Poland's people and cultural heritage.
Policies aimed at cultural genocide resulted in the deaths of thousands of scholars and artists, and the theft and destruction of innumerable cultural artifacts.
The "maltreatment of the Poles was one of many ways in which the Nazi and Soviet regimes had grown to resemble one another", wrote British historian Niall Ferguson.
The occupiers looted and destroyed much of Poland's cultural and historical heritage, while persecuting and murdering members of the Polish cultural elite.
Most Polish schools were closed, and those that remained open saw their curricula altered significantly.
Nevertheless, underground organizations and individuals – in particular the Polish Underground State – saved much of Poland's most valuable cultural treasures, and worked to salvage as many cultural institutions and artifacts as possible.
The Catholic Church and wealthy individuals contributed to the survival of some artists and their works.
Despite severe retribution by the Nazis and Soviets, Polish underground cultural activities, including publications, concerts, live theater, education, and academic research, continued throughout the war. 
The Polish political determination to deploy forces directly at the German-Polish border, based on the Polish-British Common Defense Pact, shaped the country's defence plan, "Plan West".
Poland's most valuable natural resources, industry and population were located along the western border in Eastern Upper Silesia.
Polish policy centred on their protection especially since many politicians feared that if Poland were to retreat from the regions disputed by Germany, Britain and France would sign a separate peace treaty with Germany similar to the Munich Agreement of 1938.
The fact that none of Poland's allies had specifically guaranteed Polish borders or territorial integrity certainly did not help in easing Polish concerns.
For these reasons, Poland disregarded French advice to deploy the bulk of their forces behind the natural barriers such as the Vistula and San rivers, even though some Polish generals supported it as a better strategy.
The West Plan did permit the Polish armies to retreat inside the country, but it was supposed to be a slow retreat behind prepared positions and was intended to give the armed forces time to complete its mobilization and execute a general counteroffensive with the support of the Western Allies.
The Polish General Staff had not begun elaborating the "West" defence plan until 4 March 1939.
It was assumed that the Polish Army, fighting in the initial phase of the war alone, would be compelled to defend the western regions of the country.
The plan of operations took into account, first of all, the numerical and material superiority of the enemy and, consequently, assumed the defensive character of Polish operations.
The Polish intentions were: the defence of the western regions judged as indispensable for waging the war, the taking advantage of the propitious conditions for counterblows by reserve units, the avoidance of being smashed before the beginning of Allied operations in the West and the making of decisions depending of the existing situation.
The operational plan had not been elaborated in detail and concerned only the first stage of operations.
The British and French estimated that Poland should be able to defend itself for two to three months, while Poland estimated it could do so for at least six months.
Poland drafted its estimates based upon the expectation that the Western Allies honor their treaty obligations and quickly start an offensive of their own.
In addition, the French and British expected the war to develop into trench warfare much like World War I.
The Polish government was not notified of this strategy and based all of its defence plans on promises of quick relief by their Western allies.
Polish forces were stretched thinly along the Polish-German border and lacked compact defence lines and good defence positions along disadvantageous terrain.
This strategy also left supply lines poorly protected.
One-third of Poland's forces were massed in or near the Polish Corridor, making them vulnerable to a double envelopment from East Prussia and the west.
Another third were concentrated in the north-central part of the country, between the major cities of Łódź and Warsaw.
The forward positioning of Polish forces vastly increased the difficulty of carrying out strategic maneuvers, compounded by inadequate mobility, as Polish units often lacked the ability to retreat from their defensive positions as they were being overrun by more mobile German mechanized formations.
As the prospect of conflict increased, the British government pressed Marshal Edward Rydz-Śmigły to evacuate the most modern elements of the Polish Navy from the Baltic Sea.
In the event of war the Polish military leaders realized that the ships which remained in the Baltic were likely to be quickly sunk by the Germans.
Furthermore, the Danish straits were well within operating range of the German "Kriegsmarine" and "Luftwaffe", so there was little chance of an evacuation plan succeeding if implemented after hostilities began.
Four days after the signing of the Polish-British Common Defense Pact, three destroyers of the Polish Navy executed the Peking Plan and consequently evacuated to Great Britain.
Although the Polish military had prepared for conflict, the civilian population remained largely unprepared.
Polish pre-war propaganda emphasized that any German invasion would be easily repelled.
Consequently, Polish defeats during the German invasion came as a shock to the civilian population.
Lacking training for such a disaster, the civilian population panicked and retreated east, spreading chaos, lowering troop morale and making road transportation for Polish troops very difficult.
Aeten II is located in the Outer Rim and plagued by volcanic activity, Aeten II is known for its deposits of rare stygium crystals, which are used in the construction of cloaking devices.
Because stygium crystals are extremely valuable, a number of unscrupulous prospectors descended upon Aeten II, where they competed for the rare crystals with abandon.
As a result, Aeten II became one of the most dangerous planets in the Outer Rim Territories.
By the rise of the Empire, Aeten II's cache of crystals had been all but depleted, making the manufacture of new stygium-based cloaking devices a near impossibility.
Prospectors looking to retool old mining facilities here have since found other valuable resources to mine.
Aeten II's only reference to Star Wars is through Star Wars Empire at War. 
Poland's healthcare system is based on an all-inclusive insurance system.
State subsidised healthcare is available to all Polish citizens who are covered by this general health insurance program.
However, it is not compulsory to be treated in a state-run hospital as a number of private medical complexes do exist nationwide.
All medical service providers and hospitals in Poland are subordinate to the Polish Ministry of Health, which provides oversight and scrutiny of general medical practice as well as being responsible for the day-to-day administration of the healthcare system.
In addition to these roles, the ministry is also tasked with the maintenance of standards of hygiene and patient-care.
Hospitals in Poland are organised according to the regional administrative structure, resultantly most towns have their own hospital "(Szpital Miejski)".
Larger and more specialised medical complexes tend only to be found in larger cities, with some even more specialised units located only in the capital, Warsaw.
However, all voivodeships have their own general hospital (most have more than one), all of which are obliged to have a trauma centre; these types of hospital, which are able to deal with almost all medical problems are called 'regional hospitals' "(Szpital Wojewódzki)".
The last category of hospital in Poland is that of specialised medical centres, an example of which would be the Skłodowska-Curie Institute of Oncology, Poland's leading, and most highly specialised centre for the research and treatment of cancer.
In 2012, the Polish health-care industry experienced a transformation.
Hospitals were given priority for refurbishment where necessary.
As a result of this process, many hospitals were updated with the latest medical equipment.
In 2013, the average life expectancy at birth was 76.45 years(72.53 years infant male/80.62 years infant female).