David J. Thomas, Ph.D.:
Enormous enclosed space habitat
David J. Thomas, Ph.D.:
Female space pilot in uniform
David J. Thomas, Ph.D.:
Interstellar scout on a jungle planet
David J. Thomas, Ph.D.:
Interstellar scout on an ice planet1
David J. Thomas, Ph.D.:
Interstellar scout on an ice planet2
David J. Thomas, Ph.D.:
Sailing on a sea of sand