Alan Storm has created a website with some pretty cool photos. They were found on a 4 CD-ROM set at his public library and were put out by the U.S. Geological Survey between 1897 and 1991. All of the photos are in the public doman, but they were languishing on this CD-ROM format. Alan extracted them and posted them on his site along with the accompanying text. Psst - they can be downloaded and saved. Nice work. Some of them are lovely.