@article {33821,
	title = {Great blue heron colony survey (west-central region)},
	year = {1983},
	note = {cited, American white pelican, California gull, caspian tern, double-crested cormorant, great blue heron and ring-billed gull : colony surveys - Alberta 1998. Volume 1 - Report (with 1999 update)},
	institution = {Alberta Energy and Natural Resources, Fish and Wildlife Division},
	address = {Edmonton, AB},
	author = {Hilton, M.}
}
