Чакрараху (Russian Wikipedia)

Analysis of information sources in references of the Wikipedia article "Чакрараху" in Russian language version.

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2books.google.com

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books.google.com

John Biggar. The Andes: A Guide for Climbers (неопр.). — Andes, 2005. — С. 68. — ISBN 978-0-9536087-2-0.
Cathy Biggar; John Biggar. The Andes: A Trekking Guide (англ.). — Andes, 2001. — P. 61. — ISBN 978-0-9536087-1-3.