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Norman Thornber's Pennine Underground is the guidebook which Mark and his friends would have used for their adventures underground in the Swinging Sixties.
Norman Thornber's famous guide book was first published in 1959. These articles are taken from its 1965 revision
This section contains the location maps and descriptions, taken from this guide,of seven of the nine caves described in the Loner.
The material in this section is reproduced with the kind permission of the family of Norman Thornber. It is copyright, and no part of it can be stored on a retrieval system or transmitted in any form or by any means without the permission in writing of Norman Thornber's family.