March 7, 1750–July 13, 1750 | Journal Thomas Walker's Journal (1750) In March 1750 (1749 under the Julian Calendar), Thomas Walker and several companions set off through western Virginia into modern-day Kentucky. His journal documents some of the earliest Euro-American impressions of the Cumberland region.
June 20, 1803 | Letter Thomas Jefferson to Meriwether Lewis, June 20, 1803 Thomas Jefferson issues detailed instructions to Meriwether Lewis, addressing every aspect of the upcoming expedition.