Photographer's note: "10,347 heliostats (mirrors) are part of the Crescent Dunes Solar project. Each heliostat is 34 feet tall, uses 35 mirrors, and has a surface area of 1258 square feet, or 115.7 square meters. On site photo, Crescent Dunes Solar, near Tonopah, Nevada, USA."
Photographer's assigned keywords: "110 megawatts; CSP; Concentrated Solar Energy; Concentrated Solar Power; Crescent Dunes; NV; Nevada; Solar Reserve; SolarReserve; Tonopah; concentrated solar thermal; green energy; ground-based photo; molten salt; on-site; renewable energy; storage; tower."

An artist's rendering of Boulder Canyon. Text on front of postcard: "Hoover Dam site, Boulder Canyon, looking downstream." Text on back of postcard: "Work is rapidly progressing on the new Hoover Dam, thirty miles southeast of Las Vegas. This tremendous project will cost the government in excess of $165, 000, 000.00 and will take about eight years to complete. The dam site is where the river disappears in the center of the picture. Arizona is on the left, Nevada on the right. Within a decade, the parched desert lands to the north will be washed by the waters of the largest man-made lake in the Western Hemisphere, impounded by the Hoover Dam, the greatest structure since Cheops."