Worlds of Weird 
Pyramid Books
Year :
January 1965 (First printing)
April 1977 (Second printing)
Book No. : R1125 (First printing)
V4471 (Second printing)
Edition : 1st
Format : Paperback
Pages : 158
Cover art : Virgil Finlay
Illustrations : Virgil Finlay

"The Valley of the Worm"
Non-REH Content
"Introduction" by Sam Moskowitz
"Roads" by Seabury Quinn
"The Sapphire Goddess" by Nictzin Dyalhis
"He That Hath Wings" by Edmond Hamilton
"Mother of Toads" by Clark Ashton Smith
"The Thing in the Cellar" by David H. Kellar, M.D.
"Giants in the Sky" by Frank Belknap Long
Stories selected by Leo Margulies
A third edition with a new cover was published in 1978 by Jove/HBJ Books.

Second printing

Worlds of Weird

First printing

Other editions:
Jove/HBJ  Books