Map Room

Maps to add (All of these can be found elsewhere online):

1800 Township Boundaries

1804 Township Boundaries

1850 Township Boundaries

1892 Depreciation Lands Map

1941 Butler County

1959 Butler County

Penn Pilot Aerial Project - would like to create some high-resolution tiles and have them in a clickable arrangement. Note that the Penn Pilot website has shut down. Their assets are now most easily accessible here:…; Click the thumbnail to see a low res preview or the download link to download the zip file.

PA County formation and evolution slideshow - 80 or so slides