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- Military Landscapes
- Lava Beds Caving Guide
- Existing and Reserved Street Names
- Smith River National Recreation Area Map & Guide
- Caves of Wonder
- Batman & Robin
- REPORT Cave Research Foundation Annual Report for 1988
- Engineering and Mining Journal 1921-11-26
- Final Report: Baseline Site Condition and Vandalism Assessments of Archaeological Sites in Tenmile Canyon, Grand County, Utah
- El Malpais National Monument Natural Resource Condition Assessment
- Littoral Sinkholes
- The Charmed Grotto
- Archeological Investigations at Two Sites in Dinosaur National Monument: 42UN1724 and 5MF2645
- A Bibliography of Project Gutenberg
- A Newsletter of the National Park Service Cave & Karst
- An African Diaspora Poetics of Loss
- Bolt Climbing - Vertical from the Bottom Up
- Hydrology, Hazards, and Geomorphic Development of Gypsum Karst in the Northern Black Hills, South Dakota and Wyoming
- "Information Circular 40: Caves of Washington (1963)
- Clastic Sinkhole and Pseudokarst Development in East Texas
- Volume 16, Number 1
- Clastic Sinkhole and Pseudokarst Development in East Texas
- NAAMLP 2018 Program
- Perham Down World War I Practice Trenches, Salisbury Plain, Hampshire
- Field Trip Guide 2 Karst Features of the Northern Black Hills, South Dakota and Wyoming, Karst Interest Group Workshop, September 15, 2005
- A Brief History of Exploration in Lechuguilla Cave in New Mexico, USA
- 404 06.Ps, Page 1-14 @ Normalize