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