Autor
Arnold, Chester A. 1901-1977
2
Case, E. C. 1871-1953
2
Hay, Oliver Perry, 1846-1930
2
Douglass, Raymond C. 1923-2005
1
Knowlton, Frank Hall, 1860-1926
1
Lundberg, John G.
1
Meek, F. B. 1817-1876
1
Moodie, Roy Lee, 1880-1934
1
Peck, Raymond E.
1
Reinig, W. F., 1904-1980
1
Schuchert, Charles, 1858-1942
1
Secord, Ross
1
Shimer, Hervey W.
1
Shrock, Robert R. 1904-1993
1
Smith, James Perrin, 1864-1931
1