U.S. Department of State. Records of the U.S. Department of State relating to the internal affairs of Poland, 1950-1954, decimal files 748, 848, 948.
U.S. Department of State. Records of the U.S. Department of State relating to the internal affairs of Poland, 1945-1949, decimal file 860c.
U.S. Department of State. Records of the Department of State relating to internal affairs of Poland, 1916-1944, decimal file 860c.
Records of the U.S. Department of State relating to the internal affairs of Hungary, 1950-1954, decimal files 794, 894, 994.