The future of El Pilar the integrated research & development plan for the El Pilar Archaeological Reserve for Maya Flora and Fauna, Belize-Guatemala : results of the the Mesa Redonda El Pilar, Mexico City, January 1997 = Visión futura de El Pilar : plan integrado de investigación y desarrollo de la Reserva Arqueológica El Pilar para la Flora y Fauna Mayas, Belice-Guatemala : de acuerdo a la Mesa Redonda El Pilar, Ciudad de México, Enero 1997

The Mayans in Chiapas, Mexico, past and present Fulbright-Hays Summer Seminar Abroad 1996 (Mexico)

JOHN LLOYD STEPHENS AND FREDERICK CATHERWOOD: MAYAN EXPLORERS... ED398093... UNITED STATES DEPARTMENT OF EDUCATION.

Inside the cell : the new frontier of medical science

Inventory of biological investigations related to stream water quality in the South Platte River Basin, Colorado, Nebraska, and Wyoming, 1891-1994

Impact of the lower Alamosa River water on alfalfa, southwestern San Luis Valley, Colorado--1995 follow-up study of effects from the Summitville Mine