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1974 The Miocene Caribbean faunal province and its subprovinces. Contributions to the geology and paleobiology of the Caribbean and adjacent areas. Naturforschende Gesellshaft in Basel Verhandlung 84:209-13.

1976 Age of the El Salto Formation of Nicaragua. Inst. Centroamericano Invest. y Technol. Indust. Publ. Geol. 5:18-21.

A massive Oligocene (?) pycnodonteine oyster from Costa Rica. J. Paleontol. 50:851-57.

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