INFORME SEMESTRAL. 1973:2. 1977:1. 1978:1,2. 1979:1,2.
San José, Ministerio de Obras Públicas y Transportes, 1974-179. Paperback. 6 issues, vp, fldg maps, photos, tables, bibl., wrps. With numerous articles by leading scholars of historical, geological, mineralogical, archaeological, etc., interest. More