Found a interesting NPS website where you can find old technical documents. Spent some time this morning looking at old plans for Yosemite right down to bear boxes and signs. There are 55 pages and have not looked at all of them and what documents are available but have found some very interesting info for those that are interested in Yosemite History and the changes that have been made over the years. Put in YOSE in box for search
https://pubs.etic.nps.gov/Default.aspx