Two Hawks From Earth
Philip Jose Farmer
The Fangs of the Trees
Robert Silverberg
The Further Adventures of Sherlock Holmes--The Martian Menace
Eric Brown
Flandry's Legacy: The Technic Civilization Saga
Poul Anderson
Poul Anderson Technic Civilization 07 (7)
14
Peter Clines
Threshold (1)
The Fold
Threshold (2)
Dead Moon
Threshold (3)
Terminus
Threshold (4)