What is the fine-grained topic of the following text: The two main historical sources for information on Ozaawindib are Alexander Henry (the Younger) (1765-1814), a fur trader with the North West Company who traveled throughout the Northwest (northwestern Minnesota, North Dakota, Manitoba, and west to the Pacific Ocean) from 1799 to 1808, and John Tanner, who was kidnapped in Kentucky by Shawnee Indians at around age ten and lived most of his life among the Ottawa and Ojibwe. Only return the topic.
Historical sources for information on Ozaawindib