Crossroads Adventures

• PERN: Dragonharper (1987)
• PERN: Dragonfire (1988)
• XANTH: Encyclopedia of Xanth (1987)
• XANTH: Ghost of a Chance (1988)

Anne McCaffrey's Planet Pirates

• The Death of Sleep (1990) (with Anne McCaffrey)
• The Planet Pirates (omni) (1993) (with Anne McCaffrey & Elizabeth Moon)

Mythology

1. Mythology 101 (1990)
2. Mythology Abroad (1991)
3. Higher Mythology (1993)
4. Advanced Mythology (1999)

• Applied Mythology (omnibus) (2000)

Anne McCaffrey's Doona

• Crisis on Doona (1992)
• Treaty at Doona (1994)
  also as Treaty Planet
• Doona (omnibus) (2004)

Taylor's Ark

1. Taylor's Ark (1993)
2. Medicine Show (1994)
3. The Lady and the Tiger (2004)

Dreamland

1. Waking in Dreamland (1998)
2. The School of Light (1999)
3. The Grand Tour (2000)

Robert Aspirin's Myth Adventures

• Myth-Alliances (2003)
• Myth-Taken Identity (2004)
• Myth-Told Tales (2003) (with Robert Asprin)

Anne McCaffrey's Ship Who series

• 5. The Ship Who Won (with Anne McCaffrey)(1994)
• 6. The Ship Errant (1996)
• The Ship Who Saved the Worlds (2003)(omni of two above)

Wolfe Pack: Strong-Arm Tactics (2004)

The Magic Touch (1996)

License Invoked (2001) (with Robert Asprin)

The Gods of War (1992) (with Mike Resnick and Christopher Stasheff)(edited)

Don't Forget Your Spacesuit, Dear (1996)(edited)

Xanth (with Piers Anthony)(NF)

Piers Anthony's Visual Guide to Xanth (1989)(NF)

Dragonlover's Guide to Pern (1989)(NF)

Sketching with Watercolor Pencils (2002)(NF)

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