- Series: Observers of the Unknown Series Record # 56489
- Series Tags: Lovecraftian (1), occult detective (1), aliens (1), dark science fiction (1), action (1), possession (1), body swap (1), horror (1)
- Observers of the Unknown
- The Shadow from Yith (1973) [SF] by Alan Gullette [only as by Alan D. Gullette]
- The Horror from Yith (1974) [SF] by Walter C. DeBill, Jr.
- Beneath the Dunes (1975) [SF] by Ted Pons [also as by Ted C. Pons]
- The Changeling (2002) [SF] by Walter C. DeBill, Jr.