Brainship
1 The Ship Who Sang (1969)
2 Partnership (1992) (with Margaret Ball)
3 The Ship Who Searched (1992) (with Mercedes Lackey)
4 The City Who Fought (1993) (with S M Stirling)
5 The Ship Who Won (1994) (with Jody Lynn Nye)
6 The Ship Errant (1996) (with Jody Lynn Nye)
7 The Ship Avenged (1997) (with S M Stirling)
2 Partnership (1992) (with Margaret Ball)
3 The Ship Who Searched (1992) (with Mercedes Lackey)
4 The City Who Fought (1993) (with S M Stirling)
5 The Ship Who Won (1994) (with Jody Lynn Nye)
6 The Ship Errant (1996) (with Jody Lynn Nye)
7 The Ship Avenged (1997) (with S M Stirling)
Omnibus editions
Brain Ships (2003) (with others)
The Ship Who Saved the Worlds (2003) (with Jody Lynn Nye)
The City and the Ship (2004) (with S M Stirling)
The Ship Who Saved the Worlds (2003) (with Jody Lynn Nye)
The City and the Ship (2004) (with S M Stirling)