Ducks at Lake Merritt
Ducks at Lake Merritt
Ducks at Lake Merritt
Ducks at Lake Merritt
Ducks at Lake Merritt
Greater scaups
Coots and ducks
Pintail Chicks in Nest
Pintail Chicks in Nest
Pintail Duck Development
Pintail Ducks
Pintail Duck on Nest
Pintail Duck on Nest
Canvasback Duck
Canvasback Ducks
Compilation of manuscripts on birds
Southern Oregon lecture I
Ducks at Lake Merritt
Ducks at Lake Merritt
Greater scaups
Greater scaups
Greater scaup
Greater scaups
Mallard Ducks
Scaup Ducks
Swans and Ducks
Mallard Nest and Eggs
Pintail Duck