- Series: Professor Maynard Series Record # 9921
- Series Tags: disintegrator ray (1), gravity control (1), countering invasion from Dione (1), earth is menaced (1)
- Professor Maynard
- 1 The World in the Balance (1927) [SF] by J. P. Marshall
- 2 Warriors of Space (1929) [SF] by J. P. Marshall