Maybe somebody who knows all the titles in the series can poste them here.
They were (in no particular order):
The Bride of Frankenstein
Werewolf of London
Creature From the Black Lagoon
These are the only titles I've been able to locate, and they're also the only ones listed inside the books themselves. I was also mistaken about Ramsey Campbell being the one who wrote Werewolf of London. He said in an interview I found that he only did The Wolfman, The Bride of Frankenstein, and Dracula's Daughter. Neither he nor his publisher remembers the author or authors who did the other three books.
I'll say this, though. The guy who wrote Werewolf of London is not the same guy who wrote Creature From the Black Lagoon, which wins my vote for worst movie novelization ever.