Descripción
Notas:"Prepared in cooperation with the United States Department of State as a project of the Interdepartmental Committee on Cultural and Scientific Cooperation"
Descripción Física:v. II (XXXIII, 1035 p., 192 p. de lám., [2] h. de mapas pleg., [1] h. pleg.) : il., mapas ; 24 cm
Bibliografía:Bibliogr.: p. 979-1035