49051 SF H. Beam Piper Lord Kalvan of Otherwhen 49236 SF Andre Norton Lord of Thunder 49252 SF Philip José Farmer Lord of the Trees / The Mad Goblin (May 1970) 49294 SF Edgar Rice Burroughs The Lost Continent 49301 WE Lin Searles Saddle in the Wind / Tom West Lost Loot of Kittycat Ranch (1965) 49501 SF Edgar Rice Burroughs Lost on Venus 49504 SF Edgar Rice Burroughs Lost on Venus 49506 SF Edgar Rice Burroughs Lost on Venus 49507 SF Edgar Rice Burroughs Lost on Venus 49548 SF Fred Saberhagen Love Conquers All 49851 SF Allen Steele Orbital Decay 50485 SF Allen Steele Lunar Descent 50531 SF Jack Vance Madouc 51356 SF Steve Perry The Machiavelli Interface (1986) 51375 SF Philip José Farmer The Mad Goblins / Philip José Farmer Lord of the Trees (September 1970) 51388 SF Michael Moorcock The Mad God's Amulet 51401 SF Edgar Rice Burroughs The Mad King 51402 SF Edgar Rice Burroughs The Mad King 51403 SF Edgar Rice Burroughs The Mad King 51404 SF Edgar Rice Burroughs The Mad King 51409 SF Edgar Rice Burroughs The Mad King 51544 SF Larry Niven The Magic Goes Away (1978) 51550 NA Adeline McElfresh The Magic of Dr. Farrar (1965) 51590 SF John Eric Holmes Mahars of Pellucidar 51624 SF Philip José Farmer The Maker of Universes 51626 NA Rachel Cosgrove Payes Malverne Hall (1970) 51642 WE Ray Hogan The Man from Barranca Negra 51647 SF Brian Aldiss The Malacia Tapestry (1976) 51700 NA David McDaniel The Hollow Crown Affair (1969) 51701 NA Peter Leslie The Unfair Fare Affair (1968) 51702 NA John T. Phillifent The Power Cube Affair 51702 SF Edgar Rice Burroughs The Mad King 51703 NA John T. Phillifent The Corfu Affair (1967) 51704 NA Joel Bernard The Thinking Machine Affair (1967) 51705 NA John Oram Thomas (as John Oram) The Stone-Cold Dead in the Market Affair 51706 NA Peter Leslie The Finger in the Spy Affair (1966) 51910 SF Philip K. Dick The Man Who Japed (1975) 51918 SF Steve Perry The Man Who Never Missed (1986) 51941 NA Bruce Cassiday The Fire's Center; Marcus Welby#3 (1971) 51943 SF David Alexander Smith Marathon 52035 WE Eric Allen Marshall From Whiskey Smith / Gene Tuttle Imposters in Mesquite 52075 SF Henry Kuttner, Bob Pepper, and Alicia Austin The Mask of Circe (1971) 52077 SF Fred Saberhagen The Mask of the Sun 52078