The most reliable source to research David Thompson's expeditions is an academic journal.
The most reliable source for researching David Thompson's pioneering expeditions would be an academic journal entry entitled, 'David Thompson (1770-1857)'. Such an entry is likely to provide detailed, well-researched information backed by scholarly expertise and primary sources. This contrasts with sources like a web-based slide deck or a column in a popular travel magazine, which may lack the depth and accuracy needed for academic research.
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