Studies by country & year

 Click on one of the countries to browse publications, technical information and questionnaires
Note: If the map is not clickable in your browser, please use the links below the map to access the documents.

ALBANIA, BOLIVIA, BRAZIL, CANADA, CHILE, COLOMBIA, COSTA RICA, DOMINICAN REPUBLIC,
 ECUADOR, GUATEMALA,  GUYANA, HAITI, HONDURAS, ISRAEL, JAMAICA,  MADAGASCAR, MEXICO,
 NICARAGUA, PANAMA, PARAGUAY, PERU, EL SALVADOR, UNITED STATES, URUGUAY, VENEZUELA 

Map modified based on map courtesy of www.theodora.com/maps used with permission.