@booklet {4292,
	title = {STAPPENBECK, R. 1921. Estudios geologicos e lidrogeologicos en la Zona Subandina de las Provincias de Salta y Tucuman. Anales del Ministerio de Agricultura de la Nacion, Seccion Geologia, Mineralogia y Mineria, XIV (5){\quotesinglbase} 1-136.},
	year = {1921},
	note = {STAPPENBECK, R. 1921. Estudios geologicos e lidrogeologicos en la Zona Subandina de las Provincias de Salta y Tucuman. Anales del Ministerio de Agricultura de la Nacion, Seccion Geologia, Mineralogia y Mineria, XIV (5){\quotesinglbase} 1-136.}
}
@booklet {5405,
	title = {KEMP, J.F. and BILLINGSLEY, P. 1921. Sweet Grass Hills, Montana. Bulletin of the Geological Society of America, 32: 437-78},
	year = {1921},
	note = {KEMP, J.F. and BILLINGSLEY, P. 1921. Sweet Grass Hills, Montana. Bulletin of the Geological Society of America, 32: 437-78}
}
@booklet {5758,
	title = {CLAPP, C.H. 1921. Geology of the igneous rocks of Essex County, Massachusetts. Bulletin, United States Geological Survey, 704: 1-132.},
	year = {1921},
	note = {CLAPP, C.H. 1921. Geology of the igneous rocks of Essex County, Massachusetts. Bulletin, United States Geological Survey, 704: 1-132.}
}
@booklet {5762,
	title = {CLAPP, C.H. 1921. Geology of the igneous rocks of Essex County, Massachusetts. Bulletin, United States Geological Survey, 704: 1-132.},
	year = {1921},
	note = {CLAPP, C.H. 1921. Geology of the igneous rocks of Essex County, Massachusetts. Bulletin, United States Geological Survey, 704: 1-132.}
}
