Question: Which magazine was published first, Plop! or Naval History?

Context articles: Naval History (magazine)
Naval history of Korea
Herbert Richmond
Dictionary of American Naval Aviation Squadrons
Julian Corbett Prize in Naval History
Geoffrey Rossano
Naval War College Museum
Battle of Tsushima
Plop!
D. M. Schurman

Naval History is a bi-monthly magazine published by the United States Naval Institute since 1987.
 The 72-page publication not only includes feature articles spanning the course of Naval History written by significant scholars of their subject, but also has standing features including: "Looking Back," "On Our Scope," "Naval History News," "Book Reviews," and "Museum Report."
The naval history of Korea dates back thousands of years since the prehistoric times when simple fishing ships were used.
 Military naval history dates back to the Three Kingdoms period and Unified Silla dynasties of Korea in the 7th century.
 Because of the constant coastal attacks by the Wa Japanese and other barbarian tribes, Korean shipbuilding excelled to counter these threats as a result.
 During the Unified Silla period, Jang Bogo, a merchant, rose as an admiral and created the first maritime trading within East Asian countries.
 During the Goryeo dynasty, sturdy wooden ships were built and used to fight pirates.
 Korean shipbuilding again excelled during the Imjin war, when Admiral Yi defeated the advancing Japanese fleets.
Admiral Sir Herbert William Richmond {'1': ", '2': ", '3': ", '4': "} (15 September 1871 – 15 December 1946) was a prominent Royal Navy officer, described as "perhaps the most brilliant naval officer of his generation."
 He was also a top naval historian, known as the "British Mahan", the leader of the British Royal Navy's intellectual revolution that stressed continuing education especially in naval history as essential to the formation of naval strategy.
 After serving as a "gadfly" to the British Admiralty, his constructive criticisms causing him to be "denied the role in the formation of policy and the reformations of naval education which his talents warranted", he served as the first Vere Harmsworth Professor of Imperial and Naval History at Cambridge University in 1934-1936, and Master of Downing College, Cambridge in 1934-1946.
The Dictionary of American Naval Aviation Squadrons (DANAS) is a multivolume work published by Naval Historical Center of the U.S. Department of the Navy's Naval History & Heritage Command.
 It covers naval aviation in much the same way as the "Dictionary of American Naval Fighting Ships" ("DANFS") covers commissioned vessels.
The Julian Corbett Prize in Modern Naval History was established in 1924 by Mr. H. E. Corbett in memory of his brother, the great naval historian Sir Julian Corbett (1854-1922).
 First awarded in 1926, the prize has been offered annually by the University of London for a piece of original research in the field of naval history.
Geoffrey Louis Rossano is an American author and historian with an emphasis on aviation, maritime and military history.
 He lives in Ashley Falls, MA and is an Instructor in History at the Salisbury School.
 He was the 2010 winner of the Theodore and Franklin D. Roosevelt Naval History Prize for "Stalking the U-Boat: U.S. Naval Aviation In Europe During World War I", a book that comprehensively examines how naval aviation during WW1 proved the usefulness of aviation in fleet operations.
 Rossano’s most recent book was "Hero of the Angry Sky: the World War I diary and letters of David S. Ingalls, America's first naval ace".
The The Naval War College Museum in Newport, Rhode Island, is one of 10 official museums operated by the United States Navy, under the direction of the Naval History & Heritage Command and in co-operation with the Naval War College.
 It is located at Building 10, Luce Avenue, Naval Station Newport.
 It is located in the building which first house the Naval War College, a structure built in the early 19th century to house Newport's poor.
 The building is a contributing element to a National Historic Landmark District, along with Luce Hall, the college's first purpose-built building, in recognition of the War College's historical significance.
The Battle of Tsushima (Russian: Цусимское сражение , "Tsusimskoye srazheniye"), also known as the Battle of Tsushima Strait and the Naval Battle of the Sea of Japan (Japanese: 日本海海戦, "Nihonkai-Kaisen") in Japan, was a major naval battle fought between Russia and Japan during the Russo-Japanese War.
 It was naval history's only decisive sea battle fought by modern steel battleship fleets, and the first naval battle in which wireless telegraphy (radio) played a critically important role.
 It has been characterized as the "dying echo of the old era – for the last time in the history of naval warfare, ships of the line of a beaten fleet surrendered on the high seas".
Plop!
, "The New Magazine of Weird Humor!"
, was a comic book anthology published by DC Comics in the mid-1970s.
 It falls into the horror / humor genre.
 There were 24 issues in all and the series ran from Sept./Oct.
 1973 to Nov./Dec.
 1976.
Donald Mackenzie Schurman (September 2, 1924 in Sydney, Nova Scotia; June 16, 2013 in Kingston, Ontario) was a Canadian naval historian.
 He was professor of history at Queen's University, Kingston, Ontario, and also served at the Royal Military College of Canada.
 In the Festschrift published in his honor in 1997, the editors hailed Schurman as the "founder of the serious study of naval history in Canada".