@book{110264,
	author = {Glover, Lynn. and Puerto Rico.},
	title = {Preliminary report on the geology of the Coamo quadrangle, Puerto Rico},
	publisher = {United States Geological Survey},
	year = {1961.},
	series = {Miscellaneous geologic investigations map / United States Geological Survey},
	address = {Washington, D.C.},
	note = {Four cross sections in margin.}
}