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Log of the Wookey Hole Exploration Expedition: 1935
E-bok,
2011,
Engelska,
ISBN 9781447556640
A reprint of the privately-produced 1936 edition (with additional material) describing the early cave diving exploration of Wookey Hole Caves by Graham Balcombe, Penelope Powell …
A Glimmering in Darkness
pocket,
2015,
Engelska,
ISBN 9780901031099
A collection from the principal records in the "archives" of Graham Balcombe on the events leading to the foundation of THE CAVE DIVING GROUP and notebook records of the early …