Calkin, Homer L. and Corrine Calkin. “Iowa Inventors and Inventions Part One.” The Palimpsest L (1969): 369 - 432.
Calkin, Homer L. and Corrine Calkin. “Iowa Inventors and Inventions 1843 - 1873 Part Two.” The Palimpsest L (1969): 433 - 481.
Comfort, Jan. "South Carolina Inventors and Inventions 1790-1873." The South Carolina Magazine of Ancestral Research XXV (1997): 123-136.
Fulghum, R. Neil. North Carolina Patents, 1790-1873. Raleigh, North Carolina: North Carolina Museum of History, 1979.
Holsclaw, Birdie. “Early Colorado Inventors: Colorado Patent Models in the Cliff Peterson Collection 1852 - 1890.” The Colorado Genealogist 49 (1988): 34-36.
Sharrer, Terry G. “Patents by Marylanders, 1790 - 1830.” Maryland Historical Magazine 71(1976): 50 - 59.
Walston, Mark. “Maryland Inventors and Inventions 1830 - 1860.” Maryland Historical Magazine 80 (1985): 66 - 93.
“Wisconsin Inventors.” Badger History (Special Issue). 23 (1970): 2-64, plus Teacher’s Supplement.
