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Categories Features Cave Books (Click For Categories) 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 Updated Sale Page Holiday 2023 - Rare Books & Pubs Updated Summer 2022 - Collection Books Spring 2022 - Patches, Pins, Buttons March 2021 - Private Collection Additions Jan 2021 - Private Collection Additions Collection - Calendars and Periodicals Antiquarian Books Collection - Archeology and Paleontology Collection - Carbide, Mines & Lamps Collection: Humor, Art, Song, Food, Poetry Private Collection - Show Caves Collection - Techniques Private Expedition Reports Collection - Event Guide Books Private Exp. Cave & Karst Science Private Collection - Adult Fiction Private Collection - Youth Fiction Collection - Youth Non Fiction Private Collection - Photo Tabletop Gift Certificates Sale Priced Goods Bat Books Educational (General & K-12) Regional Identification Young Readers & Read-To Caps, Hats & Bags Cards & Stationery 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 Books (Click For Categories)      - 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   - Updated Sale Page   - Holiday 2023 - Rare Books & Pubs   - Updated Summer 2022 - Collection Books   - Spring 2022 - Patches, Pins, Buttons   - March 2021 - Private Collection Additions   - Jan 2021 - Private Collection Additions   - Collection - Calendars and Periodicals   - Antiquarian Books   - Collection - Archeology and Paleontology   - Collection - Carbide, Mines & Lamps   - Collection: Humor, Art, Song, Food, Poetry   - Private Collection - Show Caves   - Collection - Techniques   - Private Expedition Reports   - Collection - Event Guide Books   - Private Exp. Cave & Karst Science   - Private Collection - Adult Fiction   - Private Collection - Youth Fiction   - Collection - Youth Non Fiction   - Private Collection - Photo Tabletop   - Gift Certificates   - Sale Priced Goods   - Bat Books      - Educational (General & K-12)      - Regional Identification      - Young Readers & Read-To   - Caps, Hats & Bags   - Cards & Stationery   - 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 > Private Collection - Youth Fiction The Hardy Boys; The secret of the Lost Tunnel    Price: $5.00  The Hardy Boys; The secret of the Lost Tunnel, Franklin W. Dixon, HB in DJ with rubs and chips, 1950, 210 pp.