Author
United States. Department of State. Bureau of European and Eurasian Affairs
2
Polski Instytut Geologiczny
1
Sokołowski, Stanisław, 1900-
1
United States. Bureau of International Labor Affairs
1
United States. Central Intelligence Agency. Directorate of Intelligence
1
United States. Department of State. Bureau of European and Eurasian Affairs,
1
United States. Department of State. Office of Public Communication. Editorial Division
1
United States. Embassy (Poland)
1
United States. Social Security Administration. Office of International Programs,
1