Bowers, pp. 14–19 Bowers, Martha H.; Muessig, Hans (1982). "Keokuk and Hamilton Bridge"(PDF). Historic American Engineering Record. Washington, D.C.: Library of Congress.
Bowers, pp. 19–20 Bowers, Martha H.; Muessig, Hans (1982). "Keokuk and Hamilton Bridge"(PDF). Historic American Engineering Record. Washington, D.C.: Library of Congress.
Bowers, pp. 21–24 Bowers, Martha H.; Muessig, Hans (1982). "Keokuk and Hamilton Bridge"(PDF). Historic American Engineering Record. Washington, D.C.: Library of Congress.
Bowers, p. 24 Bowers, Martha H.; Muessig, Hans (1982). "Keokuk and Hamilton Bridge"(PDF). Historic American Engineering Record. Washington, D.C.: Library of Congress.