@BOOK{ Book!D - 100996857,
AUTHOR = "/ by Donald Dale Jackson and the editors of Time-Life Books",
TITLE = "Underground worlds",
LIBRARY= "كتابخانه پردیس علوم (دانشگاه تهران)",
SUBJECT = "Caving -- 19th century -- History,Caving -- 20th century -- History,Caves",
URL = "/book/100996857/Underground-worlds/"}