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Simpson and Kelsal 1978 Preliminary Studies of Great Blue Heron Colonies. A report done for the Canadian Wildlife Service.
See PDF file: Simpson_&_Kelsal_1978_Preliminary_Studies_Great_Blue_Heron_Colonies_CWS
See PDF file: Simpson_&_Kelsal_1978_Preliminary_Studies_Great_Blue_Heron_Colonies_CWS