H. P. Lovecraft - The Dunwich Horror (3rd Lancer edition)

First published by Arkham House (hardback) and an abridged version by Lancer (paperback) in 1963. This 3rd Lancer edition (447-75247-095) is undated but has been verified as November 1971. Cover art is not credited (I've seen it suggested as Howard Winters, he was Art Director at Lancer Books at the time)