The Wells of Hell

From Author Wars - https://authorwars.com/publications/the-wells-of-hell-282049.html

Overview:

Title: The Wells of Hell
Author: Graham Masterton
Year: 1989
ISBN-10: 0812522117
Publisher: Tor
Price: $3.95
Pages: 320
Binding: Paperback
Type: Novel
Title Reference: The Wells of Hell
Notes: Data from Amazon.com as of 2008-12-00.
Cover artist on copyright page of Archive.org copy. There's no date for this edition, just original 1979 date and September 1982 date for "First Tor edition".