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United States of America With digital objects
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American military camp
American military camp
American troop undergoing inspection
American troop undergoing inspection
Best sidehill harvester in operation on hillside in Washington state, pulled by many horses
Best sidehill harvester in operation on hillside in Washington state, pulled by many horses
Caterpillar tractor pulling combines
Caterpillar tractor pulling combines
Digester at waste disposal plant in Madison, Wisconsin
Digester at waste disposal plant in Madison, Wisconsin
Digestors assembly with gas collector for Janesville, Wisconsin sewage disposal plant
Digestors assembly with gas collector for Janesville, Wisconsin sewage disposal plant
Flocculators and settling at sewage disposal plant in Madison, Wisconsin
Flocculators and settling at sewage disposal plant in Madison, Wisconsin
Grease tank/trap for sewage disposal plant at Madison, Wisconsin
Grease tank/trap for sewage disposal plant at Madison, Wisconsin
Holt sidehill combine powered by 5 men and 33 mules
Holt sidehill combine powered by 5 men and 33 mules
Holt sidehill combines at work on hillsides in Washington state
Holt sidehill combines at work on hillsides in Washington state
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