Interesting observation today. I went out to order some BLM high resolution maps to transfer my notes and sketches to, and bam! 404 error. Tried a couple of secondary sources and no joy there ether. Not even listed any longer. It may all be coincidental, but it did make me go hmmm. Wish I had ordered a week ago when I was looking at them. I have digital copies, so printing them up shouldn't be an issue, just more expensive. USGS and the local printer, here I come.
Maybe they purposely took them down to prevent idiots from attempting to go places they shouldn't? Seems awfully suspicious!