1950
Hayden Map Co.
1961
Alpha, Tau Rho
1927
USGS (U.S. Geological Survey)
1:125k
1937
USGS (U.S. Geological Survey)
1:125k
1919
USGS (U.S. Geological Survey)
1:125k
1913
USGS (U.S. Geological Survey)
1:125k
1907
USGS (U.S. Geological Survey)
1:125k
1910
USGS (U.S. Geological Survey)
1:125k
1988
Morley, James M.
1927
[Washington, D.C. : U.S. Geological Survey]
1:125k