Each map is simply a report of the topographic state of Spring Hill at a point in time. One can only get the most recent edition from the US Geological Survey. The back issues are available from libraries and archives map libraries. These libraries have collected, preserved and cataloged the maps knowing that if they didn't, the maps would disappear . The scientific process would use them up, consume them.
Maps are, by their very nature, impermanent.
This is different than books. Written scientific reports certainly exist. But there are other genres such as fiction, history, biography, and poetry, which are as vital now as when they were first written down. The Ramakien, the Bible, Shakespeare's plays have not changed significantly over the centuries. They were meant to last, to be a permanent part of the cultural environment.