They come in pdf but could be converted and put here if pre-1960. If I am not mistake no government publication can be copyright.
Actually, it's government authorship. In other words, if it was produced (or purchased outright) by a (United States Federal) government office, then it's in the public domain. Essentially, government ownership is public ownership.
If they only requested or sponsored it, though, then copyrights work as usual. I haven't looked at the link, yet, so I can't guess at this particular situation.