https://www.usa.gov/copyrighted-government-workshttps://www.rawpixel.com/image/4032734Edit ImageSaveSaveEditCropCustom TextUtility Building, Mammoth, Yellowstone National Park (P.W. Project F. P. 347),Sheet 1,American Bridge Company, Minneapolis Plant [blueprint],1935 October 9. Original public domain image from FlickrMorePublic DomainFree CCO U.S. Government image for Personal and Business useInfoView CC0 LicenseJPEGBanner JPEG 1200 x 798 px | 300 dpiLarge JPEG 3500 x 2329 px | 300 dpiBest Quality JPEG 7058 x 4696 px | 300 dpiFree DownloadUtility Building, Mammoth, Yellowstone National Park (P.W. Project F. P. 347),Sheet 1,American Bridge Company, Minneapolis Plant [blueprint],1935 October 9. Original public domain image from FlickrMore