Steve, every link takes me to the NPS homepage or an error page. The search engine on their home page does nothing. Hopefully this is a temporary glitch, but I noticed the same thing when trying to download Merced River Plan docs for Yosemite - except it all went to their NEPA page.
My second thought is they're making this information hard to get to reduce public comment. I hope that's not the case, but they don't seem to value public input anyway.