Metal Detecting Research and Exploration - A Complete Guide, page 65
Other Forms of Research
HISTORICAL PLATES, PLAQUES, MARKERS AND ROAD SIGNS
While driving through your community, you sure have seen such plates standing on the roadsides. In New York state, they were erected by the Department of Education in the 1930s. By marking the exact locations where historic events took place or where the early settlements once stood, these historical plaques might provide you with valuable leads.
Another Historical Marker
Some old farmhouses and homesteads bear plates that identify the original owner and show the date of their construction.
A Historical Plaque on a Farm House in Rural Area
Sometimes the house owner sets up a plate informing public about historical value of the place.
The History of the American Revolution Was Made Here
While driving through any rural area, be on the lookout for road signs that use words like: grove, park, school house, church, fort, reunion, revival, canal, lock, ferry, market, square, beach, picnic lane, battlefield, camp, etc. They may indicate potential treasure hunting sites located nearby.