1862
SMITH, George M.D., of Pennsylvania
1857
Rogers, Henry Darwin
1:317k
1888
Vermeule, C. C. (Cornelius Clarkson), 1858-1950
1:63k
1902
Gannett, Henry; Wilson, H. M.; US Coast and Geodetic Survey; Geological Survey of New Jersey
1:63k
1872
Beers, F. W. (Frederick W.)
1:127k
1899
C&GS
1:80k
1873
Hopkins, G.M.
1:253k
1848
Hassler, F. R.
1:80k
1860
Beers, S.N.
1:63k
1958
Brandywine Valley Association