Mt Everest

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Source 1:

http://publishing.cdlib.org/ucpressebooks/view?docId=ft8b69p1t6;chunk.id=0;doc.view=print

Source 2:

http://www.pbs.org/wgbh/nova/everest/resources/basecampmap.html

Source 3:

http://www.nepaleverestbasecamp.com/ebc-chola-pass-gokyo-trek.php

Source 4:

http://adventure.howstuffworks.com/outdoor-activities/climbing/mount-everest1.htm

Source 5:

http://graphnepal.com/history-of-international-tourist-in-nepal/

Source 6:

http://www.bbc.co.uk/guides/z2phn39