In Pursuit of Profit: The Annapolis Merchants in the Era of the American Revolution. (Baltimore: The Johns Hopkins University Press, 1975).
Maryland: A New Guide to the Old Line State. (Baltimore: The Johns Hopkins University Press, 1976). With Gregory A. Stiverson, Susan A. Collins, Lois Green Carr.
Law, Society & Politics. The Proceedings of the First Conference on Maryland History. (Baltimore: Johns Hopkins University Press, 1977). With Aubrey C. Land and Lois Green Carr.
An Inventory of Maryland State Papers, Part I, The Revolutionary War Era, 1775-1789. (Annapolis: Maryland Hall of Records, 1977). With Gregory A. Stiverson and Mary D. Donaldson.
A Biographical Dictionary of the Maryland Legislature, 1635-1789. (Baltimore: The Johns Hopkins University Press, 1979, 1985). With David Jordan, Alan Day, Gregory A. Stiverson.
A Guide to the Maryland Hall of Records: Local, Judicial, and Administrative Records on Microform. (Annapolis: Maryland Hall of Records, 1978). With Susan A. Collins and Christopher Allan.
The Hammond-Harwood House Atlas of Historical Maps of Maryland, 1608-1908. (Baltimore: The Johns Hopkins University Press, 1982). With Joseph M. Coale III.
Magna Charta For America. (Philadelphia; The American Philosophical Society, 1986). With Jack P. Greene and Charles F. Mullett.