There are a number of web sites which have locating data, such as lat-long.com. These sites can give you the specific location of a prominent object such as a mine or geographic location such as a mountain range. Google Earth’s locating search tools are very good. You can enter a latitude / longitude pair into Google Earth and it will take you there. Once there, you can use the Placemark function to identify a particular feature for later use.
Google Earth also has tools for creating “Paths”, which was used to identify the railroad rights of way on the maps used on this site. The Placemark and Path functions also allow for color changes and other means of making a unique mark on the maps.
Google Earth also has a measurement tool, which can be used to determine a location based upon other measurement data (such as “The station was three miles away....”. This helps get you into the ballpark for locating structures which are no longer present.
Using the Images
Once the images were created with Google Earth, they were copied to Windows Paint and adjusted to fit onto the web pages.
Full details of the use of Google Earth images are located here.