EPA Environmental Map for Union County
GIS maps for Union County
Pennsylvania County Maps from USGen Web
USGS Map of Union County from USGen Web Useful in finding cemeteries, funeral homes etc.  Many types of genealogical sources are tied to the USGS map.  From USGenWeb 
Maps located in the library
The library has a file of maps of Union County, Other nearby counties, Pennsylvania, United States and the world including thematic maps.  In addition to sheet maps the Library also has many atlases..
USGS Quadrangle Maps located in the library
Pennsylvania index to topographic maps
Snyder County County map
Richfield Quadrangle
Middleburg Quadrangle
McClure Quadrangle
Beaver Springs Quadrangle
Dalmatia Quadrangle
Freeburg Quadrangle

 3/15/06