The Harriet Tubman who led hundreds of enslaved African-Americans to freedom on the Underground Railroad is a stoic, battle-tested older black woman who looks like this:

Harriet Tubman around 1885. Chip Somodevilla/Getty Images

Or this:

But now there's a new image of a younger Tubman to add to the archives:

The new image was uncovered thanks in part to historian Kate Clifford Larson, who saw the image in a photo album once owned by Tubman's friend and fellow abolitionist Emily Howland. The image, Larson said to the Citizen, an Alabama paper, "surprised me, and I think it's going to surprise a lot of people."

"What's remarkable about this photograph is that she's so proud and dignified and beautiful," Larson said. "She looks so young. This is the vibrant young Tubman just coming off her work during the Civil War. She's building her life with her family in Auburn."

Larson estimates that Tubman was somewhere between 43 and 46 years old when the photo was taken. The image is especially welcome now that she's slated to be on the $20 bill and there's more of her life in the historical record.

The photo will be auctioned at the Swann Galleries in New York City on March 30.