Instant Belmont listing.
These are the macabre titles, including Gothic Romances, I recognised from the exhaustive Belmont listing in Jon Warren's
Official Price Guide: Paperbacks (House of Collectibles, 1991). There may be more, though Belmont/ Belmont-Tower evidently favoured SF and sleaze over horror & supernatural.
1961Dashiell Hammett [ed.] - Creeps by Night
Robert Bloch - Nightmares
Dashiell Hammett [ed.] - The Red Brain
Frank [Belknap] Long - The Horror Expert
1962Robert Bloch - Yours Truly, Jack the Ripper
Robert Bloch - More Nightmares
Robert Bloch - More Nightmares
Groff Conklin [ed.] - Twisted
1963Robert Bloch - Horror-7
Michael Avallone - Tales of the Frightened
Michael Avallone - Shock Corridor
Frank Belknap Long - The Hounds of Tindalos
1964Frank Belknap Long - The Dark Beasts
August Derleth - Mr. George and Other Odd Persons
1965H. P. Lovecraft - The Case of Charles Dexter Ward
Lyne Kenyon Engel [ed] - Basil Rathbone selects Strange Tales
1966Evelyn Bond - Heritage of Fear
1967Bernhardt J. Hurwood - Monsters and Nightmares
Robert Bloch - The Living Demons
Virginia Coffman - A Few Fiends to Tea
1968Mary Reisner - Bride of Death
Mary Reisner - Death Hall
1969Robert Bloch - Dragons and Nightmares
1970Peter Saxon - Vampire's Moon