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Image Credit Header image: Artwork by Professor Lubaina Himid, CBE. Photo: @Denise Swanson
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