The National Geographic Magazine, March, 1922, Volume XLI, Number Three. Original articles by Joseph F. Rock.

Included in this issue are:
Prehistoric Telephone Days, with 17 Illustrations by Alexander Graham Bell;
Hunting the Chaulmoogra Tree, with 40 illustrations by Joseph F. Rock;
Amid the Snows of Switzerland with 16 Full-page Engravings;
The Hill Tribes of Burma with 22 illustrations, by Sir George Soctt;
The Pueblo Bonito Expedition of the National Geographic Society with 11 illustrations, by Neil M. Judd;
Fighting Insects with Airplanes with 6 illustrations, by C.R. Neillie and J.S. Houser

Joseph Rock was commissioned by the United States Department of Agriculture to search for a tree in Southeast Asia whose oil was believed to have medicinal properties for treating leprosy. This article recounts the expedition.

A full issue,  in good condition. Hard to find.