suspended animation (2),
heat ray (2),
mars (2),
time travel (1),
lost race (1),
Mu (1),
force ray (1),
Murians (1),
time slip (1),
fossil eggs (1),
Disintegrator (1),
Martians (1),
venus (1),
invisibility (1),
space pirates (1),
Venusians (1),
Mercurians (1),
science fiction (1),
Neptune (1),
Interplanetary Guards (1),
spaceship wreck (1),
Triton (1),
Neptunians (1),
antigravity (1),
thought helmet (1),
medical examination (1),
second Moon (1),
force screen (1)
Back to the Summary Bibliography page for J. M. Walsh