E. Emmet Reid (born 1872) was a professor of chemistry at Johns Hopkins. The collection consists of reprints, extensive student notes, lecture notes, correspondence, and patents dating from 1889 to 1974.

Ernst Cloos (1898-1974) was a structural geologist and professor at The Johns Hopkins University. The collection documents Cloos's field work and research through his meticulous, detailed field notebooks and research data dating from 1921-1980.

Little is known about George S. Roberts except that he was a boarding student at Benjamin Hallowell's academy in Alexandria, Virginia in 1855. The collection consists of two volumes of geometric calculations.

John McGill was a lawyer in Urbana, Virginia (in Middlesex County), and flourished between 1827 and 1848. The collection consists of incoming letters, financial records, records of the William Shepherd estate, and J. Hopkins Brothers and Company records all ranging in date from 1827 to 1849. The bulk of the incoming letters are from Baltimore merchants.

This collection consists of a copy of a diary (1861-1865) of Lucy Rebecca Buck written during the American Civil War. In 1973, the diary was published under the title of Sad Earth, Sweet Heaven. Lucy Rebecca Buck was born in 1842 and resided near Front Royal, Virginia.

The Merryman-Crane family papers document the nineteenth century life of two families of enslavers related by marriage, one centered in Richmond, Virginia, and the other in Baltimore County, Maryland. The Merryman family papers consist of land deeds, legal documents, and correspondence spanning 1742-1908 The Crane Family papers consist of correspondence, poetry, prose, and financial documents. The material spans 1821-1908 but mainly dates from 1850-1890.

The collection (1897-1943) consists of three scrapbooks, the subjects of which are the Civil War, Abraham Lincoln and Edgar Allan Poe. The scrapbooks were compiled by Cassandra Moncure Lyne (born 1875) in collaboration with her mother, also named Cassandra Moncure Lyne (1845-1934).