Baldassarre, Guy A.. Waterfowl ecology and managment / Guy A. Baldassarre, Eric G. Bolen and D. Andrew Sunders. - New York : John Wiley , 1994. - xvii,609p. : ill.,figs.,tables ; 25cm . NULL ISBN: 0471597708 NULL Subjects--Index Terms: WATERFOWL-NORTH AMERICA-ECOLOGY Dewey Class. No.: 598.41097 / BAL/W