Bibliography
Below are lists of online resources I've used a lot of during my research on the Wissahickon Valley Region. It includes online databases, historical maps, and digital archives.
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Clifton S. Hunsicker's Montgomery County, Pennsylvania, A History, Volume 3
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Howard M. Jenkins's Historical Collections Relating to Gwynedd: A Township of Montgomery County, Pennsylvania, Settled 1698, by Welsh Immigrants, With Some Data Referring to the Adjoining Township of Montgomery, also a Welsh Settlement, 1st and 2nd Editions
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Howard W. Kriebel's A Brief History of Montgomery County, Pennsylvania, with an Accompanying Map, Prepared under the Supervision of the School Directors' Association for the Use of Schools
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Mary P. H. Hough's Early History of Ambler
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PA SHPO's Cultural Resources GIS (CRGIS) System
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Samuel T. Wiley's Biographical and Portrait Cyclopedia of Montgomery County, Pennsylvania, Containing Biographical Sketches of Prominent and Representative Citizens of the County
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The Bulletin of the Historical Society of Montgomery County, PA
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The Philadelphia Real Estate Record and Builders' Guide (1886-1940)
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Theodore W. Bean's History of Montgomery County, Pennsylvania, Volume 2
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Wissahickon Valley Public Library's Ambler Gazette Collection