Ámbito geográfico
UNITED STATES
38
LATIN AMERICA
7
ESTADOS UNIDOS
4
GREAT BRITAIN
3
MEXICO
3
EUROPE
2
AMERICA
1
AMÉRICA LATINA
1
ARGENTINA
1
BRAZIL
1
CHICAGO
1
CONNECTICUT
1
DEVELOPING COUNTRIES
1
EUROPA
1
EUROPA OCCIDENTAL
1
EUROPE, WESTERN
1
FRANCE
1
GERMANY
1
GRAN BRETAÑA
1
ILLINOIS
1
INDIA
1
MASSACHUSETTS
1
PARIS
1
SOVIET UNION
1
SWITZERLAND
1
UNIÓN SOVIÉTICA
1