Conan the Barbarian #21
Magazine Management Co. / Marvel Comics
Year :
 December 1972
Book No. : None
Edition : 1st
Format : Periodical (6.8 x 10.2 inches)
Pages : 36 pages (including front and back covers)
Cover art : Barry Windsor-Smith (pencils & inks)
Illustrations : See below 
   Conan the Barbarian #21
Other editions:
 None
Home
Contents
"The Monster of the Monoliths" (20 pages)
Inspired in part by "The Black Stone"
Writer: Roy Thomas
Pencils: Barry Windsor-Smith (page 1 and a couple of subsequent panels, layouts for the rest of the issue)
Pencils: P. Craig Russell (backgrounds); Val Mayerik (figure work)
Inks: Dan Adkins; Sal Buscema; P. Craig Russell; Val Mayerik; Mark Kersey
Colors: George Roussos
"The Hyborian Page" (Letter column)


Notes
Editor: Roy Thomas
Magazine Management Company existed from at least 1947 to 1973 when it was rebranded as Marvel Comics Group.