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Categories Features Updated Sale Page Holiday 2023 - Rare Books & Pubs Updated Summer 2022 -- Collection Books Spring 2022 Update - Patches, Pins, Buttons and More March 2021 - Private Collection Additions January 2021 - Private Collection Additions Collection - Calendars and Periodicals Antiquarian Books Collection - Archeology and Paleontology Collection - Carbide, Mines & Lamps Collection - Humor, Art, Song, Food and Poetry Speleobooks Private Collection - Show Caves Collection - Techniques Speleobooks Private Collection - Expedition Reports Collection - Event Guide Books Speleobooks Private Collection - Cave & Karst Science Speleobooks Private Collection - Adult Fiction Speleobooks Private Collection - Youth Fiction Speleobooks Collection - Youth Non Fiction Speleobooks Private Collection - Photo And Tabletop Gift Certificates Sale Priced Goods Bat Books Educational (General & K-12) Regional Identification Young Readers & Read-To Caps, Hats & Bags Cards & Stationery Cave & Karst Books Cave Bibliographies Cave Diving Cave Life Caving Techniques Educational (General & K-12) Geology, Speleology & Archeology Guidebooks (NSS Conventions) History Management & Conservation NSS Speleo Digests Photography Popular Titles and Fiction Out Of Print Titles Rescue Show Caves Speleology Related Publishers Berliner Hohlenkundliche Berichte (BHB) British Cave Research Association Cave Books (CRF) Karst Waters Institute La Venta Geographical National Speleological Society Speleo Projects WVASS and WV-VA Titles ZRC Carsologica Series Kentucky Cave Surveys Wild Caves Africa China, Middle East, India Eastern Europe & Russia Great Britain, Ireland & U.K. Mexico, Caribbean, Central & South America North America Pacific Region; West & South Western Europe World Young Readers & Read-To Caver Music CDs Figures, Sculptures & Art Fossil Bat Castings Jewelry - Earrings Jewelry - Pendants & More Jewelry - Pins Jewelry - Sets Key Rings & Zipper Pulls Magnets Mugs & Cups Office, Home & Gifts Ornaments Pens & Pencils Plush Toy Bats Posters Quilts By Emily Shirts & Clothing Signs Socks Stickers Ties Toy & Flexible Bat Figures Youth & Infant Clothing Bob Liebman Estate - Books Convention and Grotto Patches

Features   - Updated Sale Page   - Holiday 2023 - Rare Books & Pubs   - Updated Summer 2022 -- Collection Books   - Spring 2022 Update - Patches, Pins, Buttons and More   - March 2021 - Private Collection Additions   - January 2021 - Private Collection Additions   - Collection - Calendars and Periodicals   - Antiquarian Books   - Collection - Archeology and Paleontology   - Collection - Carbide, Mines & Lamps   - Collection - Humor, Art, Song, Food and Poetry   - Speleobooks Private Collection - Show Caves   - Collection - Techniques   - Speleobooks Private Collection - Expedition Reports   - Collection - Event Guide Books   - Speleobooks Private Collection - Cave & Karst Science   - Speleobooks Private Collection - Adult Fiction   - Speleobooks Private Collection - Youth Fiction   - Speleobooks Collection - Youth Non Fiction   - Speleobooks Private Collection - Photo And Tabletop   - Gift Certificates   - Sale Priced Goods   - Bat Books      - Educational (General & K-12)      - Regional Identification      - Young Readers & Read-To   - Caps, Hats & Bags   - Cards & Stationery   - Cave & Karst Books      - Cave Bibliographies      - Cave Diving      - Cave Life      - Caving Techniques      - Educational (General & K-12)      - Geology, Speleology & Archeology      - Guidebooks (NSS Conventions)      - History      - Management & Conservation      - NSS Speleo Digests      - Photography      - Popular Titles and Fiction      - Out Of Print Titles      - Rescue      - Show Caves      - Speleology Related Publishers         - Berliner Hohlenkundliche Berichte (BHB)         - British Cave Research Association         - Cave Books (CRF)         - Karst Waters Institute         - La Venta Geographical         - National Speleological Society         - Speleo Projects         - WVASS and WV-VA Titles         - ZRC Carsologica Series         - Kentucky Cave Surveys      - Wild Caves         - Africa         - China, Middle East, India         - Eastern Europe & Russia         - Great Britain, Ireland & U.K.         - Mexico, Caribbean, Central & South America         - North America         - Pacific Region; West & South         - Western Europe         - World      - Young Readers & Read-To   - Caver Music CDs   - Figures, Sculptures & Art   - Fossil Bat Castings   - Jewelry - Earrings   - Jewelry - Pendants & More   - Jewelry - Pins   - Jewelry - Sets   - Key Rings & Zipper Pulls   - Magnets   - Mugs & Cups   - Office, Home & Gifts   - Ornaments   - Pens & Pencils   - Plush Toy Bats   - Posters   - Quilts By Emily   - Shirts & Clothing   - Signs   - Socks   - Stickers   - Ties   - Toy & Flexible Bat Figures   - Youth & Infant Clothing   - Bob Liebman Estate - Books   - Convention and Grotto Patches Features > Cave & Karst Books > Out Of Print Titles Click for larger image Challenge Underground    Price: $16.00    By Bruce L. Bedford, who tries to answer "What sense of adventure and imagination drives .....to endure extreme physical discomfort". 1975, 192pp, hb, w/dj.