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Books about Hillsgrove:
Hillsgrove quadrangle, Pennsylvania, 1995: 7.5 minute series (topographic) by Geological Survey (U.S.) (1998)
Flood insurance study : township of Hillsgrove, Pennsylvania, Sullivan County (SuDoc FEM 1.209:422064) (1990)
Wiki information Hillsgrove:
Hillsgrove Township is a township in Sullivan County, Pennsylvania, United States. The population was 287 at the 2010 census.