Manly Wade Wellman books in order
13 books in the catalogue, about 106 hours of reading in all; the shortest takes 3 hours and the longest 19 hours.
1 series and 11 standalone books in the catalogue.
Silver John
5 books
The Old Gods Waken 3.4 h After Dark length not known
The Lost and the Lurking 3.3 h The Hanging Stones length not known
The Voice of the Mountain length not known
Standalone books
The Hounds of Hell 3.5 h 
Dark Forces 10.0 h 
Microcosmic Tales 6.0 h 
The Fantasy Hall of Fame [22 stories] 7.9 h 
Magicats! 4.8 h 
The Dark Descent 13.8 h 
John the Balladeer 5.1 h 
Isaac Asimov Presents Tales of the Occult 6.5 h 
The Color of Evil 8.2 h 
The Vampire Archives 18.9 h 
Zombies! Zombies! Zombies! 14.9 h