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National Speleological Society (NSS)
Living on Karst - A reference guide for landowners in limestone regions.
National Cave Rescue Comission (NCRC)
NSS Geo2 Long & Deep Cave Lists
SPELEO Link Page
USGS Exploring Caves

NSS Grotto Information for Pennsylvania
Bald Eagle Grotto
Bucks County Grotto
District of Columbia Grotto
Franklin County Grotto
Huntingdon County Cave Hunters
Loyalhanna Grotto
Mid-Appalachian Region (MAR)
Mid-Atlantic Karst Conservancy (MAKC)
Nittany Grotto
Northeast Cave Conservancy
Northern New Jersey Grotto
Pennsylvania Cave Conservancy (PCC)
Philadelphia Grotto
Pittsburgh Grotto

Cave Surveying
Online Topo Maps
Aerial Photographs and Topo Maps
NSS Survey and Cartography Section
WinKarst Cave Mapping Software - The bottom of this page has pointers to other useful mapping software.
Compass Cave Survey Software

Pennsylvania Bat Specifics - Descriptions & photos of bats that live in PA.
Pennsylvania Cave Conservancy
Pennsylvania Topographic & Geologic Survey

NEARCTICA - The Natural History of North America including Education, Family subjects, Natural History, Conservation, Environment, Ecology, Evolution, Geology, Paleontology, Commerce, Organizations and Systematics.