Subjects: *Snow cover; *Climate change; Twentieth centuryPoland; Sudeten
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Subjects: COMMUNISM; BATTLE of Warsaw, Poland, 1920; NATIONALISMPOLAND
Subjects: TWENTIETH century; POWER (Social sciences); SOCIAL revolutionPOLAND; FINLAND
Subjects: SURFACE area; HISTORICAL maps; WATER managementPOLAND
Subjects: CURRICULUM; TEXTBOOKS; INDOCTRINATION