Ruthven, John A.
Top flight speed index to waterfowl of north america
Top flight speed index to waterfowl of north america; : Field guide in full color
/ John A. Ruthven, William Zimmerman.
- 2ª ed..
- N. Jefferson S.T. : Moebius Printing Company, 1968.
- 112 p. : il. ; 29 cm.
- (Duck Hunters').)
Ornitologia--América do Norte--Guia / Patos--América do Norte--Guia /
CDU 598.2/.9(7)(036)
