Willow Grove, PA, a set on Flickr.
Interesting place in the course of human aerial and other events.
Part of a larger archaeology testing of the Naval Air Station Willow Grove, PA as the US Navy turns over some properties for other uses. Site of the development of the Pitcairn-Cierva Autogyro and successful airmail carriers before sale of field to US by Harold Pitcairn. Research here also led to numerous developments in aviation and aerospace, i.e., in navigation, GPS. A rented Trimble GeoXH GPS with ESRI ArcPad for GIS integration and recording of tests and features was used.