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[2]
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BALL IJ, 1973, THESIS U MINNESOTA
[4]
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COULTER MW, 1968, 682 VERM FISH GAM DE
[6]
COWARDIN LM, 1973, 168 US FISH WILDL SE
[7]
CRISSEY WF, 1969, 6 CAN WILDL SERV REP, P161
[8]
DERRICKSON SR, 1975, THESIS U MINNESOTA
[9]
DONAGHEY R, 1974, WATERFOWL USE BOREAL
[10]
DREWIEN RC, 1969, 6 CAN WILDL SERV REP, P102