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British Caving. An Introduction to Speleology. Edited by C.H.D. Cullingford. (Second Edition, Revised.) [By Members of the Cave Research Group. With Bibliographies.].

Cave Research Group (England)

出版	Routledge & Kegan Paul, 1962
URL	http://books.google.com.hk/books?id=1J0lMwEACAAJ&hl=&source=gbs_api