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Scientific American 1917-04-21

ScientificAmerican1917-04-21.jpg Reader's Digest 1940-03ThumbnailsScientific American 1920-08-14Reader's Digest 1940-03ThumbnailsScientific American 1920-08-14Reader's Digest 1940-03ThumbnailsScientific American 1920-08-14Reader's Digest 1940-03ThumbnailsScientific American 1920-08-14Reader's Digest 1940-03ThumbnailsScientific American 1920-08-14

Plunging through an irrigating ditch with a continuous-tread tractor.

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Plunging through an irrigating ditch with a continuous-tread tractor.