Author
Boewe, Charles E., 1924-
3
Audubon, John James, 1785-1851
2
Hance, Anthony M.
2
Hudspeth, Robert N.,
2
Rafinesque, C. S. 1783-1840
2
Reynaud, Georges, 1941-
2
Seaton, Beverly
2
Thoreau, Henry David, 1817-1862,
2
Witherell, Elizabeth Hall,
2
Xie, Lihong, 1952-
2
Agassiz, Elizabeth Cabot Caryd, 1822-1907
1
Arden, Harvey
1
Audubon, Maria R. 1843-1925
1
Bonta, Marcia
1
Coues, Elliott, 1842-1899
1
Crosby, Marshall R.
1
Davis, Wm. Harper
1
Duggan, Eileen P.
1
Ewan, Joseph, 1909-1999
1
Ewan, Nesta
1
Geographical Society of Philadelphia
1
Hoffmann, Nancy E.
1
Hollowell, Victoria C.
1
Jeffery, David
1
Jones, Dewitt
1
Littlehales, Bates
1
McKinley, Daniel
1
Morrison, Ernest
1
Muhlenberg, Gotthilf Henrich Ernst 1753-1815
1
National Geographic magazine (April 1973)
1
New York State Museum
1
Norwood, Vera
1
Oeland, Glenn
1
Peale family
1
Stroud, Patricia Tyson
1
Van Horne, John C.,
1
Warner, Deborah Jean
1