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libraryofcongress, dc:identifier=httphdllocgovlocpnpfsac1a35268, xmlns:dc=httppurlorgdcelements11, clouds, sky, crane, people, work, bridge, construction, workers, steel, lift, dam, tennesseevalleyauthority, tva, douglasdam, excavation, palmer, alfredpalmer, transparency, color, hoist, derrick, trestle, tennessee, boom, latticedboom, lattice, outrigger, windingdrum, platform, slewingplatform, sheave, riveted, cab, jib, gantry, racking, revolving, steelbraced, mechanicaladvantage, lever, fulcrum, pulley, hydrauliccylinder, wirerope, winder, heavyequipment, rails, gantrycrane, constructionforms, concretepouring, seviercounty
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