- Industries of Delaware: Historical and descriptive review : cities, towns and business interests, institutions, manufacturing and commercial advantages by Richard Edwards, 1880
- The Delaware River Bridge bonds of the city of Philadelphia and the Sinking Funds for their retirement by Robert J Patterson, 1934
- Flood insurance study city of Westerville, Ohio, Franklin and Delaware counties (SuDoc FEM 1.209:390179)
- Rand McNally City Map Delaware Marion/Newark Ohio
- A personnel system for the city of Rehoboth Beach, Delaware by Andrew D Zimmerman, 1977
- Synopsis of wills in books 1-3 (1811-1859), Delaware County, Ohio by Charlotte S Kuhns, 1967
- Cemetery records, Delaware County, Ohio: Delaware Burial Grounds, Delaware, Ohio by Paul M Cunningham, 1953
- Index of Revolutionary soldiers buried in Delaware County, Ohio (Early vital records of Ohio / Daughters of the American Revolution) by Murray Main, 1959
- Gardens of Philadelphia -- Gardens and Arboretums of the City and Delaware Valley
- Hydrology of the Manokin, Ocean City, and Pocomoke aquifers of southeastern Delaware (Report of investigations / Delaware Geological Survey ; no. 38) by Arthur L Hodges, 1984
- FM Delaware County (USA City Maps) by Franklin Maps, 2002-10
- A Digest of the Acts of Assembly: Relating to Delaware County, Pennsylvania and the ordinances of the Chester City Council by Ward Raymond Bliss, 1882
- Report of Allen Hazen to Trenton Water Board on pollution and filitration of the Delaware River water supply for the city of Trenton, N.J by Allen Hazen, 1900
- The Delaware and Hudson route: A new through line from Philadelphia to Bethlehem, Mauch Chunk, Scranton, Cooperstown, Sharon Springs, Saratoga, Lake George, ... railroads (Taintor's route and city guides) by Charles Newhall Taintor, 1877
|