Спелеологија — разлика између измена
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* {{Cite book|ref=harv|last=Marbach|first=George |last2=Tourte|first2=Bernard |last3=Alspaugh|first3=Melanie|title = Alpine Caving Techniques: A Complete Guide to Safe and Efficient Caving|year=2002|isbn=978-3-908495-10-9|edition=2002|accessdate=4. 3. 2017}}
* {{Cite book|ref=harv|title=Cave Minerals of the World 2nd Edition |last=Hill|first=Carol A.|last2=Forti|first2=Paolo|publisher= Natl Speleological Society |edition= 2nd |year=1997|isbn=978-1-879961-07-4
* {{Cite book|ref=harv|title=Speleology: Caves & the Cave Environment |last=Moore|first=George W.|last2=Sullivan|first2=G. Nicholas|others= National Speleological Society |publisher= Cave Books |edition= revised |date=1. 6. 1997 |isbn=978-0-939748-46-4
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