Public domain
Public Health Serive Investigation Commission to the China-Burma higway, Chefang Valley, China. Long straight ditch the morning after it had been dug. The soil is so soft that the walls shift in one night whenever there is action by small springs
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Credit linePublic Health Serive Investigation Commission to the China-Burma higway, Chefang Valley, China. Long straight ditch the morning after it had been dug. The soil is so soft that the walls shift in one n. 1939-01-01. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.
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