H.P. Lovecraft

The Dream-Quest of Unknown Kadath, first printing May 1970, cover art by Gervasio Gallardo:

The Doom That Came to Sarnath, first printing February 1971, cover art by Gervasio Gallardo:

During the series, Ballantine also issued two Lovecraft titles, one which they had previously published.  These books are not part of the series proper, but are certainly of associated interest.  The Survivor and Others is bylined as by H.P. Lovecraft and August Derleth, but the stories are completely by Derleth.

Fungi from Yuggoth and Other Poems, first printing February 1971, cover art by Gervasio Gallardo:

The Survivor and Others, second printing February 1971 (the first Ballantine printing was August 1962), cover art by Gervasio Gallardo:

Mervyn Peake

The three Titus novels all predate the Ballantine Adult Fantasy series, but with the Fourth Printing September 1973 and the Fifth Printing January 1974, the unicorn's head logo appeared on the front covers.

Titus Groan, fourth printing September 1973, cover art by Bob Pepper:

Gormenghast, fourth printing September 1973, cover art by Bob Pepper:

Titus Alone, fourth printing September 1973, cover art by Bob Pepper:

George MacDonald

Lilith, first printing September 1969, cover art by Gervasio Gallardo:

Phantastes, first printing April 1970, cover art by Gervasio Gallardo:

Evenor, first printing November 1972, cover art by Gervasio Gallardo:

H. Warner Munn

Merlin's Ring was published after the official end of the Ballantine Adult Fantasy series, but clearly it was intended to be a part of it, as the Lin Carter introduction indicates.

Merlin's Ring, first printing June 1974, cover art by Gervasio Gallardo:

E.R. Eddison

The Worm Ouroboros, seventh printing September 1973, cover art by Barbara Remington:

The first printing of The Worm Ouroboros, April 1967, preceded the Ballantine Adult Fantasy series. Only the seventh printing (above), out of twelve printings between 1967 and 1981, has the unicorn's head on the cover.

Three of Eddison's other novels also preceded the Ballantine Adult Fantasy series, but are sometimes considered a part of it. The final novel, The Mezentian Gate, appeared the month before the official start of the Ballantine Adult Fantasy series, and it is labelled by the publisher "A Ballantine Adult Fantasy" in a line running up the top left of the front cover.

Mistress of Mistresses, first printing August 1967, cover art by Barbara Remington:

A Fish Dinner in Memison, first printing February 1968, cover art by Barbara Remington:

The Mezentian Gate, first printing April 1969, cover art unsigned but by William Benson in the style of Barbara Remington:

William Morris

The Wood Beyond the World, first printing July 1969, cover art by Gervasio Gallardo:

The Well at the World's End Volume I, first printing August 1970, cover art by Gervasio Gallardo:

The Well at the World's End Volume II, first printing September 1970, cover art by Gervasio Gallardo:

placeholder, 2nd printing December 1972

The Water of the Wondrous Isles, first printing November 1971, cover art by Gervasio Gallardo:

The Sundering Flood, first printing May 1973, cover art by Gervasio Gallardo:

After the Ballantine Adult Fantasy series ended, The Well at the World's End was reprinted in one volume.

The Well at the World's End, first combined printing July 1975, cover art by Gervasio Gallardo:

Lord Dunsany

The King of Elfland's Daughter, first printing June 1969, cover art uncredited on copyright page, but signed by Bob Pepper at lower right of front cover:

At the Edge of the World, first printing March 1970, cover art by Ray Cruz:

Don Rodriguez: Chronicles of Shadow Valley, first printing May 1971, cover art by Bob Pepper:

Beyond the Fields We Know, first printing May 1972, cover art by Gervasio Gallardo:

The Charwoman's Shadow, first printing February 1973, cover art by Gervasio Gallardo:

Over the Hills and Far Away, first printing April 1974, cover art by Gervasio Gallardo:

Lin Carter

Dragons, Elves, and Heroes, first printing October 1969, cover art by Sheryl Slavitt:

The Young Magicians, first printing October 1969, cover art by Sheryl Slavitt:

Golden Cities, Far, first printing October 1970, cover art by Ralph Iwamoto and Kathleen Zimmerman:

New Worlds for Old, first printing September 1971, cover art by David McCall Johnston:

The Spawn of Cthulhu, first printing October 1971, cover art by Gervasio Gallardo:

Discoveries in Fantasy, first printing March 1972, cover art by Peter Le Vasseur:

Great Short Novels of Adult Fantasy I, first printing September 1972, cover art by Gervasio Gallardo:

Great Short Novels of Adult Fantasy Volume II, first printing March 1973, cover art by Gervasio Gallardo:

Imaginary Worlds, first printing June 1973, cover art by Gervasio Gallardo:

Carter published another title with Ballantine that is not officially part of the series, though why it was excluded is a matter of doubt.  Yet the book is certainly ancillary to series and should be listed here:

Lovecraft: A Look Behind the "Cthulhu Mythos," first printing February 1972, cover art by Gervasio Gallardo:

H. Rider Haggard

The People of the Mist, first printed December 1973, cover art by Dean Ellis:

Peter S. Beagle

The Last Unicorn, fourth printing October 1972, cover art by Gervasio Gallardo:

The first printing February 1969, preceded the Ballantine Adult Fantasy series.  The fourth printing (above) through the seventh printing, February 1974, have the unicorn's head logo on the cover. 

Sanders Anne Laubenthal

Excalibur, first printed in August 1973, cover art by Gervasio Gallardo:

H. Rider Haggard and Andrew Lang

The World's Desire, first printed January 1972, cover art credited to Vincent di Fate on copyright page, but this is in error, as the art is by Mati Klarwein:

William Hope Hodgson

The Boats of the Glen Carrig, first printed in February 1971, cover art by Robert LoGrippo:

The Night Land: Volume I, printed July 1972, cover art by Robert LoGrippo:

The Night Land: Volume II, printed July 1972, cover art by Robert LoGrippo (the reversed image of the art for volume I):

Katherine Kurtz

Deryni Rising, first printed August 1970, cover art by Bob Pepper:

Deryni Checkmate, first printed May 1972, cover art by Bob Pepper:

High Deryni, first printed September 1973, cover art by Alan Mardon:

Joy Chant

Red Moon and Black Mountain, first printing March 1971, cover art by Bob Pepper:

Red Moon and Black Mountain, second printing November 1973, cover art by Ian Miller (surname mispelled "Millar" on copyright page):

Ariosto, translated by Richard Hodgens

Orlando Furioso: The Ring of Angelica Volume I, first printing January 1973, cover art by David McCall Johnston: