The daily progressive-miner., 1917-03-01
LARGE NEW MAP OF WASHINGTON CITY
 AND VICINITY
Covers 465 Square Miles and is Sold by Geological Survey at
 Nominal Price of 9 Cents


 Nominal Price of 9 Cents
 A new topographic map of Washing ion. D. C.. and vicinity just issued by he United States Geological Survey, of the Department of the Interior. is aow ready for distribution. This new map is the result of recently complet- ad topographic surveys. and is typi- cal example Of the arr of map-making as it has been refined and developed 6y the Geological Survey after more than generation Of study and experi- ence TLa map was actually drawn in rhe field by the Surveys topographic engineers. and represents the highest accuracy and refinement that can be attained in a map printed on the scale used. T. shows an area Of 465 square miles. which includes almost every form or topography. from the lowlands along the Potomac Drive to the broken country in Rock Greek Park and the picturesque gorge Of the Potomac above the city. The map is printed in four cclors. Black is used to repres- =nr works Of man-such as railroads. wagon roads. and houses; blue is used TO represent streams and water surfa- ces: and brown is used for the curves, showing elevation. which represent, al most like a photograph. every up and down in the area. The automobile edition" of this map shows through routes Of aI-the-year-round good roads in bright red and connecting links in dotted red lines.
 4 distance Of , inches on the map represents l mile on the ground-that is. the scale is to 316S0, l inch on the map corresponding to 31.6S0 inches on the ground The relative heights shown by curved contour lines drawn TO represent heights above mean sea level ar intervals Of 10 feet.
 Forty Per Cent of L. s. Mapped.
 Beginning nearly 40 years ago to construct accurate topographic and ge- ologic maps Of both the known and the unexplored regions Of the United Sta tes. the Geological Survey has steadily progressed with this part of it's work until topographic maps Of 40 per cent Of the country are now published, be sides maps for large areas in Alaska and Hawaii. Extensive areas have also been covered by geologic maps, and all the work from the beginning of the field survey 10 the printing Of -he finished map is done by this Gov erment bureau. Other activities Of the Survey are the classification of public .ands. the annual collection Of mineral statistics Of the United States. and in vestigations of the Nations water re sources. all involving the publication Of scientific and technical reports con aiming over 20.000 pages annually. During the last 9 years over S15.000 050 has been spent by the Geological Survey in geologic and topographic surveys in the United States. Last l years expenditure was nearly $500, ,00' not 10 mention the cost Of engraving the copper plates and printing th' maps ill from to p colors.
 Map of the World
 Part of the Geological Surveys map ping comes under plan for an inter national map-a map of the world ol the scale of 1.00O,0O0-the American
 portion of which shall be uniform il / scale and symbols with those represen ting areas on the other continents ! The special map production under thi
 plan is being supplemented by the is
 suance of State maps on the sam
 scale, which is about Is miles to tn inch, and also on Q scale twice as large | All these topographic maps are sold [ 1 the public at slight increase over tn cost Of paper and printing, the nomina price charged taking no account (