TY  - BOOK
AU  - Olson,Storrs L.
AU  - Feduccia,Alan
TI  - Presbyornis and the origin of the Anseriformes (Aves, Charadriomorphae)
U1  - 591 
PY  - 1980///
CY  - Washington
PB  - Smithsonian Institution Press
KW  - Anseriformes
KW  - Evolution
KW  - Presbyornis
KW  - Birds
N1  - Bibliography: p. 23-24
ER  -