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.

These are letters to Thomas Clarke, Isaac Roberdeau, and Jonathan Williams, Jr., about the defense of Philadelphia against possible British attack.

This collection consists almost entirely of letters, mostly written by Jefferson, to various people. The largest portion of the letters are from Jefferson to Louis Hue Girardin concerning the latter's work in completing The history of Virginia: from its first settlement to the present day, Volume 4 . Of particular interest is Jefferson's notes on his colleges' role in that history, including the plot to establish a dictator of Virginia. The letters to Girardin also include discussions of plants, the building of the University of Virginia, and books.

John Marshall was appointed the fourth chief justice of the United States by President John Adams. In the thirty four years he served on the bench, Marshall presided over the Court's evolution into an institution with power equal to both the executive and legislative branches of the Federal Government. The Marshall collection consists of manuscript drafts for 62 opinions delivered by the chief justice in the Fourth Circuit Court of the United States between 1803 and 1831. These opinions seem to be from cases heard in Richmond, VA. The collection is arranged chronologically by the court term.

Catherine Wistar Bache (1805-1886) was the point of connection between two of Philadelphia's most illustrious families of the late eighteenth century. Daughter of the physician Caspar Wistar, in November 1797 she married Dr. William Bache, who was the son of Richard Bache and the grandson of Benjamin Franklin. Primarily letters to Mrs. Bache (wife of Dr. William Bache) of Philadelphia, from Mrs. David Hosack (nee Mary Eddy), Mrs. Elizabeth Trist, and Mary Jones. The letters are personal and concern family life, activities of husbands, etc., with many references to Caspar Wistar, There are comments on diseases, education (at William and Mary College), war, and politics. References are also made to the deaths of Richard Bache and Caspar Wistar, and to Benjamin Franklin's Stockado (a musical instrument).

Fothergill writes to an English physician, J. Woodforde, from Bath and Bristol in England and from Philadelphia. The letters concern their common interests in medicine, with comments on current events, American and Philadelphia society, and medicine in the United States.

After emigrating from Germany to Philadelphia in 1796, Peter Adolph Grotjahn established himself within the city's mercantile community, trading opportunistically both inland and coastwise as far as the Caribbean. In 1812, he began publishing a commercial newspaper, Grotjan's Philadelphia Public Sale Reports and he became increasingly active in local Democratic Party politics. The APS copy of Peter Grotjahn's memoir is a typescript copy of an original volume held at the Historical Society of Pennsylvania. Written for his grandchildren, the memoir begins with a relatively brief genealogical discussion, but concentrates on his personal and political life and commercial experiences prior to 1817. The last section of the autobiography was completed posthumously from notes, and includes extracts from Grotjahn's diary as late as 1844.

Robert Maskell Patterson (1787-1854, APS 1809) was a professor of chemistry and natural philosophy at the University of Pennsylvania (1812-1828) and professor of natural philosophy at the University of Virginia (1828-1835). He was director of the U.S. Mint from 1835 to 1851. His father, Robert Patterson, was a revolutionary soldier, professor of mathematics at the University of Pennsylvania (1779-1814), and director of the U.S. Mint (1805-1824).