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![Utility 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 Flickr](https://images.rawpixel.com/image_200/cHJpdmF0ZS9sci9pbWFnZXMvd2Vic2l0ZS8yMDIyLTA1L2ZsMTkxMTI3MDY2NzktaW1hZ2Uta3UyY252MXMuanBn.jpg)
Utility 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 Flickr
Utility 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 Flickr
Public DomainFree CCO U.S. Government image for Personal and Business use