- Series: Magdah Series Record # 25277
- Series Tags: cave man (1), adventure (1), time probe (1)
- Magdah
- 1 Mammoth Man (1951) by Herbert J. Campbell [only as by Roy Sheldon]
- 2
Two Days of Terror (1951)
by
Herbert J. Campbell
only appeared as:
- Variant: Two Days of Terror (1951) [as by Roy Sheldon]
- Translation: Zwei Tage der Angst [German] (1959) [as by Roy Sheldon]