Search Constraints
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File Format
video/mp4
Remove constraint File Format: video/mp4
File Format
video/x-msvideo
Remove constraint File Format: video/x-msvideo
Resource Type
moving image
Remove constraint Resource Type: moving image
Subject
scientific expeditions
Remove constraint Subject: scientific expeditions
Time Period (Topic)
1930s (1930-1939)
Remove constraint Time Period (Topic): 1930s (1930-1939)
Time Period (Topic)
1920s (1920-1929)
Remove constraint Time Period (Topic): 1920s (1920-1929)