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Smart, Jeffery K. "From Plowshare to Sword: Historical Highlights of Gunpowder Neck and Edgewood Arsenal to the End of World War I." Harford Historical Bulletin 63 (Winter 1995): 3-49.
Valentino, David Wayne. Tectonics of the Lower Susquehanna River Region, Southeastern Pennsylvania and Northern Maryland: Late Proterozoic Rifting to Late Paleozoic Dextral Transpression. Ph.D. diss., Virginia Polytechnic Institute and State University, 1993.
Goldstine, Herman H. "A Brief History of the Computer." Proceedings of the American Philosophical Society 121 (1977): 339-345.