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Cooperative Behaviour at 26,000ft over Sixty Years. Springer. ISBN 9781137525154 – via Google Books. "Everest: Wally Berg". May 14, 2010. Alan's page...

of Institutional Change on ... - David Savage, Benno Torgler. ISBN 9781137525154. Retrieved 2015-07-23. "Manaslu Dispatches". Altitude Junkies. Retrieved...

Cooperative Behaviour at 26,000 ft over Sixty Years. Springer. pp. 5–. ISBN 978-1-137-52515-4. "Everest K2 News ExplorersWeb – Jamie McGuiness about David Sharp:...