Hill, Elaine Alais Susannna ORCID: 0000-0003-4984-9446 and Hall, Adrian M. (2015) Northern Sump Index 2015. Cave Diving Group (CDG). ISBN 978-0901031082
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Abstract
A collection from the principal records in the "archives" of Graham Balcombe on the events leading to the foundation of the Cave Dving Group and notebook records of the early "ops." in which he took part.
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