"York Explored the West With Lewis and Clark, but His Freedom Wouldn't Come Until Decades Later" Smithsonian Magazine (June 24, 2024)
"An enslaved man was crucial to the Lewis and Clark expedition's success. Clark refused to free him afterward." - The Washington Post (January 13, 2020)
"Black History: How York, an enslaved man, helped Lewis and Clark explore the West"
KSDK (local news coverage)
York (explorer) - Wikipedia Comprehensive biographical entry
York, enslaved man - Britannica - Scholarly encyclopedia entry covering his role, treatment, and biographical facts
"York After the Lewis and Clark Expedition" - U.S. National Park Service
"York's Early Life: Before the Lewis and Clark Expedition" - U.S. National Park Service
York - Lewis & Clark National Historic Trail - U.S. National Park Service
"York – The Enslaved Naturalist"- George Mason University (jmjp.gmu.edu)
"York of the Lewis and Clark Expedition" - Lewis and Clark in Kentucky (January 6, 2023)
Journals of the Lewis and Clark Expedition Online - University of Nebraska, Lincoln - Contains searchable full-text primary sources
Lewis and Clark: Natural History Discoveries - Library of Congress Research Guide