60563 EDGAR RICE BURROUGHS The Oakdale Affair (cover by Frank Frazetta; July 1974; 1st ACE printing; listed as "First Time in Paperback")
60564-8 EDGAR RICE BURROUGHS The Oakdale Affair (cover by Frank Frazetta; c.1974; nd; listed as "First Time in Paperback"; 2nd ACE printing)
60565-6 EDGAR RICE BURROUGHS The Oakdale Affair (cover by Frank Frazetta; c.1974; nd; Charter edition; 3rd ACE printing)
60681 BRAD STEIGER (ed.) The Occult World of John Pendragon (c.1967; 1968; 2nd ACE printing; occult/paranormal)
61480 The EDITORS OF SCIENCE & MECHANICS (compilers) The Official Guide To UFO's (1968; 1st ACE printing)
62160-0 FRED SABERHAGEN An Old Friend of the Family (1970)
62201-9 MARGARET ERSKINE (aka MARGARET WETHERBY WILLIAMS) Old Mrs. Ommanney Is Dead (c.1955; 1967; nd; 2nd ACE printing; ACE Gothic Mystery)
62674-2 BEN ELISCO On Any Given Sunday (1982; ACE Charter edition)
62701 WILLO DAVIS ROBERTS Once A Nurse (c.1966; ACE Nurse Romance Series)
62781 ELIZABETH SALTER Once Upon A Tombstone (c.1965; 1972; 2nd ACE printing; ACE Gothic Novel)
62937-8 CHARLOTTE ARMSTRONG (aka CHARLOTTE ARMSTRONG LEWIS) The One-Faced Girl (c.1963; 1965; nd)
62937-8 (back cover)
62983 SHEILA BISHOP The Onlooker (c.1971; nd; ACE Gothic Mystery)
62984 SHEILA BISHOP The Onlooker (cover by Wm. R. Ross; c.1971; nd; ACE Gothic Mystery)
63424-9 NICK CARTER (house pseudonym for JACK CANON) Operation Sharkbait: Killmaster #187 (1984; 1st ACE printing - Charter imprint)
63510 BARBARA O'BRIEN Operators and Things (c. 1958; 1964; nd; occult/paranormal)
63750 JOHN MACKLIN Orbits of the Unknown (1969; 1st thus; occult/paranormal)
64255 JOHN MACKLIN Other Dimensions (nd; occult/paranormal)
64255 (back cover)
64281-9 JANE BLACKMORE The Other Mother (original title: The Other Room; 1972)
64426-0 NICK CARTER The Ouster Conspiracy (cover by George Gross; nd; 1st ACE printing - Charter imprint)
64475 JOHN MACKLIN Out of this World (1972; occult/paranormal)
64510 EDGAR RICE BURROUGHS The Outlaw of Torn (cover by Krenkel; c.1968; later printing; listed as "complete and unabridged")
64510 EDGAR RICE BURROUGHS The Outlaw of Torn (cover by Frank Frazetta; c.1968; 1973; 2nd ACE printing)
64513-5 EDGAR RICE BURROUGHS The Outlaw of Torn (cover by Frank Frazetta; c.1968; 1978; nd)
64595 MARGARET ERSKINE (aka MARGARET WETHERBY WILLIAMS) The Painted Mask (original title: The Limping Man; 1972; 1st thus; ACE Gothic Mystery)
65085-6 NICK CARTER (house pseudonym used jointly by ANSEL CHAPIN and DEE STUART) The Pamplona Affair (1978; 1st ACE Charter printing)
65123 MARK SHIPPER Paperback Novel (1980; 1st ACE printing; fiction)
65176-3 NICK CARTER (house pseudonym for H. EDWARD HUNSBURGER) The Parisian Affair (1981; 1st ACE Charter printing)
65251 JOHN MACKLIN Passport to the Unknown (c.1968; nd; occult/paranormal)
65351-9 ELIZABETH KELLIER The Patient at Tonesburry Manor (c.1966; nd; 2nd ACE printing; ACE Nurse Romance Series)
65366-9 CHAIM BERMANT The Patriarch (1982; 1st thus; ACE Charter edition; historical fiction)
65441-8 ANNE MAYBURY (aka ANNE BUXTON) The Pavilion at Monkshood (c.1965; nd; ACE Gothic Novel)
65442 ANNE MAYBURY (aka ANNE BUXTON) The Pavilion at Monkshood (c.1965; 1973; nd; ACE Gothic Novel)
65443-6 ANNE MAYBURY (aka ANNE BUXTON) The Pavilion at Monkshood (c.1965; January 1973; ACE Gothic Novel)
65862-5 SHEILA BISHOP Penelope Devereux (1966; nd; ACE Regency Romance)
65863-3 SHEILA BISHOP Penelope Devereux (1966; ACE Regency Romance)
65873 ELIOT ASINOF People vs. Blutcher (1971; nonfiction)
65895 JAN ROFFMAN (aka MARGARET SUMMERTON) Mask of Words (original title: A Penny For The Guy; c.1965; ACE Gothic Mystery Novel)
I have cross-listed this title in both the ACE Singles Mystery and ACE POTPOURRI sections. These are somewhat difficult to classify.
65965 JANET CAIRD Perturbing Spirit (c.1966; nd)
65989 JANET CAIRD Perturbing Spirit (c.1966; 1968; nd)
66240 DIANE La POINT Picture of Death (June 1975; 1st ACE printing; ACE Gothic Novel)
66381 LENA BROOKE McNAMARA Pilgrim's End (cover by Bosch; c.1967; 1973; 2nd ACE printing; ACE Gothic Novel)
67075-X RAYMOND BLANK Playing The Game: Strategies For Your Career (1982; 1st ACE printing and PBO; career planning)
67081-4 NICK CARTER (house pseudonym for ROBERT J. RANDISI) Pleasure Island (cover by George Gross; 1981; 1st ACE printing - Charter imprint)
67081-4 (back cover)
67095 RICHARD NEELY The Plastic Nightmare (cover by Uldis Klavins, 1969, 1st ACE printing)
67400 RAYMOND BUCKLAND (Dr.) A Pocket Guide to the Supernatural (1969; 1st ACE printing; occult/paranormal)
67401 RAYMOND BUCKLAND (Dr.) A Pocket Guide to the Supernatural (c.1969; nd; 2nd ACE printing; occult/paranormal - different cover art)
67450 MAURICE DRUON The Poisoned Crown (c.1957; nd; historical novel)
67697-9 ELIZABETH RENIER Prelude to Love (1967; 1st ACE printing; ACE Georgian/Regency Romance)
67700 JOHN MACKLIN Prelude to Nightmare (1970; 1st ACE printing; ACE Star edition; occult/paranormal)
67801-4 NICK CARTER Pleasure Island (cover by G. Gross; 1981; 1st ACE Charter printing)
67852 DOROTHY EDEN (aka DOROTHY ENID EDEN) The Pretty Ones (c.1967; nd; listed as "First American Edition;" ACE Star edition; ACE Gothic Mystery)
67853 DOROTHY EDEN (aka DOROTHY ENID EDEN) The Pretty Ones (c.1967; 1972; 4th ACE printing; ACE Gothic Mystery)
67854 DOROTHY EDEN (aka DOROTHY ENID EDEN) The Pretty Ones (c.1967; nd; ACE Gothic Mystery)
The Pretty Ones was originally published as ACE K-230 (1967)
67865-3 TIM WARNAK Crossed Swords (1978; 1st ACE printing; photo cover; movie tie-in)
67930 RUTH ABBEY (aka RUTH PATTISON) Prisoner of the Manor (c.1971; 1973; ACE Gothic Novel)
68520 MAX HASSELL Prophets Without Honor (1971; 1st ACE Star printing; occult/paranormal)
68540 RUTH ABBEY (aka RUTH PATTISON) Portrait of Doubt (May 1973; 1st ACE printing; ACE Gothic Novel)
68768 FRANCESCA CHIMENTI Psychiatrist's Nurse (1973; 1st ACE printing; ACE Nurse Romance Series)
69128-3 NICK CARTER The Puppet Master (1982; 1st ACE printing - Charter imprint)
69655-4 SAMUEL EDWARDS (aka NOEL B. GERSON) The Queen's Husband (1979; 1st ACE printing; historical fiction)
69656-2 NICK CARTER The Q-Man (1981; 1st ACE printing - Charter imprint)
69800 SHEILA BISHOP The Quick Brown Fox (1973; 1st ACE printing; ACE Gothic Novel)
69840-9 LANORA MILLER Quickthorn (cover by J. Malmed; February 1975; 1st ACE printing; ACE Gothic Novel)
69891 GEORGETTE HEYER The Quiet Gentleman (c.1951; 1968; ACE Romance)
69946-4 THOM RACINA Quincy, M. E. #2 (1977; 1st ACE printing and PBO; photo cover)
69971 MARGARET SUMMERTON Quin's Hide (c.1966; 1973; 2nd ACE printing; ACE Gothic Novel)