Explorer and Captain of the Karluk Expedition.
See also: http://id.loc.gov/authorities/names/no97036199
The graph displays the other subjects mentioned on the same pages as the subject "Bartlett, Bob, 1875-1946". If the same subject occurs on a page with "Bartlett, Bob, 1875-1946" more than once, it appears closer to "Bartlett, Bob, 1875-1946" on the graph, and is colored in a darker shade. The closer a subject is to the center, the more "related" the subjects are.