It was an eBay offering (out of Canada) but it didn't come with any provenance. But I liked the photo. The copy I bought (for not much) doesn't have any halftone dots so it's not out of a book. I had a hunch it was somewhere along Clear Creek. I was guessing something around Idaho Springs and that it wasn't, in fact D&RG as the seller stated. Thanks, Bruce (and Chris Walker), for the clarification. I like the image, just for the crew shot.