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. III (XXVI, 986 p., 126 p. de lám., [3] h. de mapas pleg.) : il., mapas ; 24 cm
Bibliografía:Bibliogr.: p. 903-986