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