The Hour of the Dragon: The Weird Works of Robert E. Howard, Volume 4
Cosmos Books
Year : September 2008
Book No. : 0843959258
Edition : 1st
Format : Paperback
Pages : 304
Cover art : Ken Kelly
Illustrations : None
 The Hour of the Dragon: The Weird Works of Robert E. Howard, Volume 4        
Other editions:

"One-Shot" by Paul Herman (Introduction)
"The Hour of the Dragon"
Introduction to "The Hyborian Age"
"The Hyborian Age"
Edited by Paul Herman
All the stories have been edited back to match the original pulp publications.
This book includes material from the Wildside Press volume "Hours of the Dragon"
The Cosmos Books series is based off the Wildside Press series. It combines two or more volumes at a time (as well as taking out some content with copyright questions) to make a new five book series in mass market paperback format.  
Published by Dorchester Publishing Co. in collaboration with Wildside Press.  "Cosmos Books" is the property of Wildside Press.
Introduction to "The Hyborian Age" is a letter to Donald A. Wolheim from H. P. Lovecraft that accompanyed the manuscript of "The Hyborian Age."
"The Hyborian Age" is cited as being reprinted from its original appearance in THE PHANTAGRAPH, as a three-part serial, February 1936, August 1936, and October-November 1936.   However, this statement is in error. THE PHANTAGRAPH appearance is incomplete and only goes up to the time of Conan.  This appearance of "The Hyborian Age" in this volume is complete.