Author
Dale, T. Nelson 1845-1937,
Geological Survey (U.S.),
12
Coons, A. T.,
1
Eckel, Edwin C. 1875-1941,
1
Gregory, Herbert E. 1869-1952,
1
Hillebrand, W. F. 1853-1925,
1
Smith, George Otis, 1871-1944,
1
State Geological and Natural History Survey of Connecticut,
1
State Survey Commission of the State of Maine,
1