@article {68821,
	title = {Alternate Energy Sources Study},
	year = {Undated},
	note = {Northern Alberta, Athabasca deposit; Eastern Venezuela, Orinoco deposits},
	pages = {1-10},
	keywords = {Canada, Gas, hydrocarbons, Oil, Venezuela},
	author = {Roberts, A. E.}
}
@article {67556,
	title = {Selected Geologic Literature on the California Continental Borderland and Adjacent Areas, to January 1, 1975},
	volume = {714},
	year = {1975},
	pages = {1-116},
	institution = {Department of the Interior},
	keywords = {California, Continental slope, Gas, minerals, Oil, petroleum, Sedimentary rocks},
	isbn = {714},
	author = {Roberts, A. E.}
}
