1940
U.S. Dept. of Agriculture Bureau of Soils
1:63k
1842
Tanner, Henry S.
1:1m
1846
Mitchell, Samuel Augustus
1838
Bradford, Thomas G.
1:2m
1881
C. Colby
1878
Cram, George Franklin
1:32k
1857
Colton, G.W.
1934
Leahy, J.F.
1879
1852
Grassl, J. (Joseph)
