Ámbito geográfico
UNITED STATES
21
LATIN AMERICA
13
ARGENTINA
9
BRAZIL
8
ESTADOS UNIDOS
5
CHILE
3
EUROPE
3
SOUTH AMERICA
3
SOUTHERN CONE OF SOUTH AMERICA
3
SOVIET UNION
3
AMÉRICA LATINA
2
CAMBODIA
2
COLOMBIA
2
CUBA
2
DEVELOPING COUNTRIES
2
FOREIGN COUNTRIES
2
AFRICA
1
AFRICA, SOUTHERN
1
ALBANIA
1
AMÉRICA LATINA
1
AMÉRICA DEL SUR
1
ASIA
1
BRASIL
1
CENTRAL AMERICA
1
CHINA
1
ECUADOR
1
EL SALVADOR
1
EUROPA
1
EUROPA OCCIDENTAL
1
EUROPE, WESTERN
1
HONDURAS
1
MACEDONIA
1
MALI
1
MEXICO
1
MEXICO CITY
1
RUSIA
1
RUSSIA
1
URUGUAY
1