A page from Cook's 1906 diary showing his map of Ruth Glacier.

Some of the original diaries Cook kept have survived. Their location is indicated below:

1891-92 North Greenland Expedition: None known
1893 Zeta cruise: Library of Congress
1894 Miranda cruise: Explorers Club of New York
1897-1899 Belgica expedition: Not located as yet
1901 Erik voyage: None known
1903 McKinley expedition: None known
1906 McKinley expedition: Library of Congress
1907-09 North Pole expedition: Library of Congress/Copy in Copenhagen, Denmark
1915-16 Everest expedition: Library of Congress
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