60s? Postcard Big Rock Candy Mtn. Utah, Iffy and Jiffy, Mountain Lynx Cubs

"Big Rock Candy Mountain, Utah--Iffy and Jiffy-Iffy, male, and Jiffy, female, mountain Lynx cats were captured in their den, located a few miles from Big Rock Candy Mountain in an almost inaccessible area, when only a few days old. They were raised by Mrs. Ben J. Dieringer on a milk bottle for a few months and have grown to be splendid pets." Moderate edge and corner wear; top right corner diagonally creased (might not show in scan); light soiling; pre-cancellation and pencil notations on reverse (see scan).