Photographs (scale 1:20000) were taken from Historical Aerial Photographs of Pennsylvania (Pennsylvania Geological Survey). An orthoimage is also displayed for 2005 with land cover analysis circles and buffers. The orthoimage (scale 1:10,699) was created with PAMAP Program Cycle 1 High Resolution Orthoimage 2003 – 2006 (PA DCNR).
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- Pennsylvania Department of Conservation and Natural Resources, Bureau of Topographic and Geological Survey and United States Geological Survey (2003 to 2006) PAMAP Program Cycle 1 High Resolution Orthoimage 2003 – 2006. www.pasda.psu.edu/.
- Pennsylvania Geological Survey, Historical Aerial Photographs of Pennsylvania. Penn Pilot. www.pennpilot.psu.edu/. Accessed 13 Dec 2012.