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wood prints harris and ewing wood prints transportation wood prints tractor wood prints caterpillar track wood prints tracked vehicle wood prints human wood prints machine wood prints western front wood prints europe wood prints hauling wood prints history wood prints technology wood prints engineering wood prints transport wood prints military wood prints

photographs harris and ewing photos transportation photos tractor photos caterpillar track photos tracked vehicle photos human photos machine photos western front photos europe photos hauling photos history photos technology photos engineering photos transport photos military photos

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Tracked artillery tractor. US Army soldiers using a tracked tractor to haul an artillery gun carriage. Several types of continuous track vehicles were invented in the 19th century, but the first successful commercial models appeared in the early 1900s. First using steam and then petrol engines, they were used in farming and in logging, and by the time of World War I had been adapted for use in tanks and to haul artillery. Photographed in 1918.

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