Vintage Harper Torchbooks What is Christianity? Book by Arnold Harnack

This is a pre-owned copy of "What is Christianity?" by Adolf Harnack, a Harper Torchbook edition. The cover features a blue, pink, and purple abstract design on a gray background. The book shows wear, including scuffs and discoloration on the cover and spine. A price sticker is adhered to the front. The pages are yellowed with age, and there is an inscription on the inside cover.