Author
United States. Central Intelligence Agency
5
Library of Congress. Federal Research Division
2
Cathcart, James Bachelder, 1917-
1
Hanratty, Dennis Michael, 1950-
1
Hudson, Rex A.
1
Instituto Geológico Nacional (Colombia)
1
Instituto Nacional de Investigaciones Geológico-Mineras
1
Irving, Earl M. 1911-
1
Meditz, Sandra W., 1950-
1
Mojica G., Pedro E.
1
Nordin, Carl F.
1
Pérez-Hernández, David
1
Singewald, Q. D. 1902-1987
1
United States. Agency for International Development
1
United States. Bureau of International Labor Affairs
1
United States. Department of State
1
United States. Department of the Treasury. Office of Foreign Assets Control
1
United States. Embassy (Colombia)
1
Venezuela. Ministerio del Ambiente y de los Recursos Naturales Renovables
1
Zambrano O., Francisco
1