Blueprints (reprographic copies)

The Harry Fletcher Brown collection, spanning the years 1881-1960 (bulk dates 1910-1952), contains correspondence, newspaper clippings, speeches, business cards, legal documents, printed material, ephemera, a photograph, World War I medal, programs, and blueprints of his Wilmington, Delaware, residence.

Blueprints of designs for row houses in Philadelphia designed by Philadelphia architect James C. Fernald (fl. 1884–1929).

The William Livermore papers give a comprehensive account of the career of a U.S. Army engineer in the mid-to-late nineteenth century.

Personal and professional papers of William John Williams, an analytical chemist who immigrated to the United States in 1885 from Abergele, North Wales in Great Britain, and worked in a number of manufacturing fields, including fertilizers, soaps, bleaches, brickmaking, and sewage and water treatment. A tremendous amount of his work was with phosphates, reflected in this collection by the substantial amount of notes and correspondence about various chemical processes involving phosphates.

Civil engineer, surveyor, and landlord Wilbur T. Wilson (1856-1942) maintained this collection of survey notebooks, files, plans, blueprints, and approximately 500 maps related to land and structures in his home of Newark, Delaware.

The Woman's Club of Claymont (Del.), records, spanning the dates 1920-2002, and detail the social and civic life of this women's club located in Claymont, Delaware.