@booklet {5286,
	title = {BLOOMFIELD, K. and CEPEDA-DAVILA, L. 1973. Oligocene alkaline igneous activity in NE Mexico. Geological Magazine, 110: 551-5.},
	year = {1973},
	note = {BLOOMFIELD, K. and CEPEDA-DAVILA, L. 1973. Oligocene alkaline igneous activity in NE Mexico. Geological Magazine, 110: 551-5.}
}
