Actions for Geologic map and cross section of the Abra quadrangle, Costa Rica [cartographic material] = Mapa geologico y corte transversale de la hoja Abra, Costa Rica
Geologic map and cross section of the Abra quadrangle, Costa Rica [cartographic material] = Mapa geologico y corte transversale de la hoja Abra, Costa Rica / by Rolando Castillo M. and Richard D. Krushensky
"Prepared in cooperation with the Oficina de Defensa Civil and the Dirección de Geología, Minas, y Petróleo, Ministerio de Industria y Comercio, under the auspices of the Government of Costa Rica and the Agency for International Development, U.S. Department of State." Geologic mapping 1966-67. English and Spanish. Includes col. cross section and index map. Contour interval 20 meters.
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