The trumpeter swan : its history, habits and population in the United States
1960
Banko, Winston E. |
Species monitoring
The California condor, 1966-76 : a look at its past and future
1978
Wilbur, Sanford R. |
The current status and welfare of the California condor
1965
Miller, Alden H. |
McMillan, Ian I. |
McMillan, Eben |
Report of the advisory panel on the California condor
1978
Ricklefs, Robert E. |
The screech owl : its life history and population ecology in northern Ohio
1975
VanCamp, Laurel F. |
Henny, Charles J. |
The prairie chicken in Wisconsin : highlights of counts, behavior, movements, turnover and habitat
1973
Hamerstrom, Frederick |
Hamerstrom, Frances |
Waterfowl and their wintering grounds in Mexico, 1937-1964
1981
Saunders, George B. |
Saunders, Dorothy Chapman |
Landespflegerisches Gutachten zu geplanten Deichbaumassnahmen in der Leybucht
1978
Dahl, Hanns-Jörg |
Heckenroth, Hartmut |
Die Vogelwelt des Kreises Lübz
1976
Kintzel, Walter |
Mewes, Wolfgang |
Die Vögel des Odenwaldes
1980
Horst, Fritz |