@article {27834,
	title = {The gravity field of northern Saskatchewan and northeastern Alberta with maps No. 16 - Green Lake-Stanley. No. 17 - Mudjatik-Geikie. No. 18 - Black Lake. No. 19 - Lake Athabasca. No. 20 - McMurray},
	volume = {Series Dom. Obs. No. 16-20},
	year = {1968},
	institution = {Gravity Maps},
	author = {Walcott, R. I.}
}
