Author
Law Library of Congress (U.S.). Global Legal Research Directorate,
118
Gutiérrez, Norma C.,
70
Infobase,
59
Geological Survey (U.S.),
58
Library of Congress. Congressional Research Service,
58
SpringerLink (Online service)
57
Mexico
38
Oxford Scholarship Online
37
EBSCOhost
36
Geological Survey (U.S.)
36
Infobase
36
Films for the Humanities & Sciences (Firm)
35
United States. Department of State
33
United States,
32
Independent Production Fund
29
United States. Congress. Senate. Committee on Foreign Relations
28
Guerra, Gustavo,
26
Mexico,
25
United States. Department of State,
24
United States. Interdepartmental Committee on Scientific and Cultural Cooperation,
22
Universidad Nacional Autónoma de México. Instituto de Geología,
19
Villarreal, M. Angeles,
16
Independent Production Fund,
15
Seelke, Clare Ribando,
15
Mexico. Dirección de Minas y Petróleo,
14
Medina, Rubens,
13
United States. Interdepartmental Committee on Scientific and Cultural Cooperation
13
Smithsonian Institution
12
United States. Environmental Protection Agency,
11
Army War College (U.S.). Strategic Studies Institute
10
SpringerLink (Online Service)
10
United States
10
United States. President (1993-2001 : Clinton)
10
Clarke, Stephen F.,
9
ScienceDirect (Online service)
9
United States. Congress. House. Committee on Foreign Affairs. Subcommittee on Western Hemisphere Affairs
9
Commission for Environmental Cooperation (Montréal, Québec)
8
U.S. Fish and Wildlife Service
8
United States. Central Intelligence Agency
8
United States. Congress. House. Committee on Foreign Affairs
8
United States. Congress. House. Committee on International Relations
8
United States. Congress. House. Committee on Small Business
8
Universidad Nacional Autónoma de México. Instituto de Geología
8
Wilson, Ivan F. 1916-
8
Law Library of Congress (U.S.). Hispanic Law Division,
7
Smithsonian Institution. Press,
7
United States. Congress. House. Committee on Government Reform. Subcommittee on Criminal Justice, Drug Policy, and Human Resources
7
United States. Congress. House. Committee on International Relations. Subcommittee on the Western Hemisphere
7
United States. Congress. Senate. Committee on Finance
7
Carrasco, Davíd
6
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