Harriet Tubman's Boston (U.S. National Park Service)
Harriet Tubman Underground Railroad Visitor Center (U.S. National Park Service)
National Park Service
File:Harriet Tubman, Boston African American National Historic Site, 1911. (fc9e4b780b174ceea6ef29f741070eb4).jpg - Wikimedia Commons
Harriet Tubman - Wikipedia
Network to Freedom - Using GIS to Promote and Preserve Underground Railroad History - American Conservation Experience
Finding Harriet Tubman
Exploring African American Heritage
Harriet Tubman Underground Railroad National Historic Park - Atlas Obscura
READ: Harriet Tubman's 1913 obituary in The Citizen
Harriet Tubman Underground Railroad Byway
Harriet Tubman honored on commemorative coins
Harriet Tubman Underground Railroad Byway
Harriet Tubman, An Introductory Timeline - The Philadelphia Office of Arts, Culture and the Creative Economy