Stringfield, E. b. M. H. a. V. Karst important Karst regions of the Northern hemisphere. Elsevier Publishing Company.
Dyfyniad Arddull ChicagoStringfield, Edited by M. Herak and V.T. Karst Important Karst Regions of the Northern Hemisphere. Elsevier Publishing Company.
Dyfyniad MLAStringfield, Edited by M. Herak and V.T. Karst Important Karst Regions of the Northern Hemisphere. Elsevier Publishing Company.
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