Milton Guevara

Playboy.

Glamour.

O.

Teen Vogue.

All these magazines have something in common.

They're no longer in print.

While these — and many other — publications have shifted to digital only in recent years, there's a print magazine bucking the trends and still going strong: Thrasher magazine. Created by skateboarders for skateboarders, Thrasher celebrates its 40th anniversary this month.

For years, researchers interested in the life of Frederick Douglass have traveled to a retired surgeon's dining room table in Savannah, Ga., to pore over his private collection of newspaper clippings, manuscripts and letters. Dr. Walter O. Evans' collection is the largest known on the abolitionist and politician who was formerly enslaved. It's one that Evans has been working on for decades.

"It consists of a great deal of personal material from the Douglass family — letters that he wrote to his sons and to various other people," Evans tells NPR.