All the USGS topo maps are online so even if you tossed your physical copies you can still find and print one if/when you need it. Most historical ones back to the late 1800s are online too. Great resource if you like to study and understand the development of a particular area. The old ones (pre ~1950) show each individual building and feature.
“The old ones (pre ~1950) show each individual building and feature.”
I can’t recall if it was a TV show or an aquaintance, but they would use those old maps to identify where the old outhouse was on a property.
Then ask the current owner if they could dig around and then share whatever decent finds they found.
On one project I was using fancy metal detection gear to locate possible buried debris, drums, etc. prior to development. One of the small spots I located they dug up. No hazardous waste - but an old outhouse with Revolutionary War era buttons, bottles, etc. (Of course I never saw any of it!).
Where online are they?