This parabolic mirror system is part of the solar furnace operated for the U.S. Army at White Sands Missile Range… https://www.rawpixel.com/image/8803009/photo-image-vintage-city-buildingFree Image from public domain licenseExterior view of several of the solar heated greenhouses at the University of Arizona Environmental Research Laboratory at… https://www.rawpixel.com/image/8802999/photo-image-nature-vintage-cityFree Image from public domain licenseA large (28 foot) raft running Wild Sheep Rapids on the Snake River during a conservation trip through Hells Canyon… https://www.rawpixel.com/image/8770092/photo-image-person-water-boatFree Image from public domain licenseExterior view of one of the solar greenhouses at the University of Arizona Environmental Research Laboratory at Tucson. https://www.rawpixel.com/image/8802997/photo-image-nature-water-soilFree Image from public domain licenseClose-up of stream bed illustrates the dry climate of the proposed strip-mining area of Sarpy Basin. Mining operation would… https://www.rawpixel.com/image/8802957/photo-image-texture-brick-soilFree Image from public domain licenseCaterpillars in flowering tree, 05/1972. Photographer: Norton, Boyd. Original public domain image from Flickr https://www.rawpixel.com/image/8803013/photo-image-flower-plant-leafFree Image from public domain licenseCliff Palace is the largest remaining village of the pre-Columbian Indians. They lived in the Mesa Verde area until drought… https://www.rawpixel.com/image/8802872/photo-image-brick-wall-windowFree Image from public domain licenseSolar heating and cooling demonstration project, which is funded by the National Science Foundation. https://www.rawpixel.com/image/8802833/photo-image-house-nature-landscapeFree Image from public domain licenseHovenweep National Monument, 05/1972. Photographer: Norton, Boyd. Original public domain image from Flickr https://www.rawpixel.com/image/8802980/photo-image-paper-flower-plantFree Image from public domain licenseThis is a demonstration unit of a backyard solar heating unit built by the Sunglow Corporation, under license from the… https://www.rawpixel.com/image/8802824/photo-image-wood-vintage-buildingFree Image from public domain licenseSmall (17-foot) raft running Wild Sheep Rapids on the Snake River in Hells Canyon. https://www.rawpixel.com/image/8770091/photo-image-person-water-boatFree Image from public domain licenseTwo inflated polyethylene solar heated "greenhouses" located at the University of Arizona Environmental Research Laboratory… https://www.rawpixel.com/image/8802998/photo-image-vintage-building-architectureFree Image from public domain licenseCliff Palace - first major Indian ruins discovered in the Mesa Verde, 05/1972. Photographer: Norton, Boyd. Original public… https://www.rawpixel.com/image/8803005/photo-image-art-light-woodFree Image from public domain licenseThe solar furnace at White Sands Missile Range, Alamogordo New Mexico. https://www.rawpixel.com/image/8802853/photo-image-light-flare-interior-designFree Image from public domain licenseFlat plate solar heating collectors built by the Solaron Corporation, and installed on the roof of the Gump Glass Company in… https://www.rawpixel.com/image/8770099/photo-image-sky-person-birdFree Image from public domain license"Teepee" burner incinerates lumber mill's waste, 05/1972. Photographer: Norton, Boyd. Original public domain image from… https://www.rawpixel.com/image/8803014/photo-image-art-smoke-paintingFree Image from public domain licenseAn inflated polyethylene greenhouse serves as the entrance to the office of the University of Arizona Environmental Research… https://www.rawpixel.com/image/8802986/photo-image-flower-plant-artFree Image from public domain licenseLush tropical garden inside a solar heated greenhouse at the University of Arizona Environmental Research Laboratory at… https://www.rawpixel.com/image/8803007/photo-image-plant-palm-tree-artFree Image from public domain licenseSipapu Bridge, White Canyon. Natural Bridges National Monument, 05/1972. Photographer: Norton, Boyd. Original public domain… https://www.rawpixel.com/image/8803010/photo-image-mountain-nature-landscapeFree Image from public domain license