Number 71

Mailed February 2010

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Edited by Chris Chénier; Layout by Gaël Hervé

Contents

Editorial Chris Chénier
Caving the ‘net -Ian McKenzie
Castleguard Cave Diving 2009 -Martin Groves
Safe Caving: 3 Things to Know -Doug Munroe
Sustainable Mapping -Philipp Hauselmann
The Sierra Negra in a PDA -Luc Le Blanc
Haig Glacier Caves -Chas Yonge
Lower Ulysses: Sistema Purificación -Dan Green
Every-Day-Dave -Chas Yonge
Ja Caving: Interview with Stefan Stewart
Yucatán Underground -Patricia Beddows
Cenotes of the Yucatán -Tania Lemieux
Cave Temperature -Chris Smart

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