This is a compilation of manuscript and printed items, with some extensive annotations by Parker on the published items. There are various editions of the "Army Register," or "Register of the Army of the U.S.," from 1813-1816, published both in Washington and Philadelphia, with Parker's corrections, additions, and manuscript versions appended. Some of the volumes contain printed regulations, orders, and laws, with his annotations, such as "An Act for Establishing Rules & Articles . . . of the Armies of the U.S." (Washington, 1808); General orders, 1815; U.S. War dept. Letter from the Secretary of war...relative to the...act fixing the military peace establishment... 1816; U.S. Congress. House. Military Committee. Report...1817; U.S. War dept. Letter from the acting Secretary of war...relative to a mutiny said to have taken place at Norfolk...1817. The contents of "U.S. Army Registers, Regulations, Orders, etc., 1801-1815" are listed as: strength of the army; distribution of the officers; commanders of regiments; number of officers authorized by law; strength of regiments; distribution of the army at the close of the war; strength of the army in 1817; a correct register of the army...at the close of the campaign of 1814; regulations, orders, registers, and reports to Congress; etc.