Looking for 1960s YA book about portal to parallel universe
1890
Children's book with "square triangles" in parallel universe?
111991
Trying to find the name of a sci fi anthology book, or just the titles of one or more stories
26358
Book about ancient Martian astronauts being the root of modern humanity and time travel
129715
Looking for a book featuring a soldier/marine travelling to a different time/universe
100531
Novel about a teleportation device and a con artist alien
113857
A mutation-themed short story from the 60s or 70s
74443
YA Time travel/teleportation novel. Plot required using helmet (or other head gear)
17094
Identity novel, short story or book series... slower than light space battles, time dilation and boardings, several planets
2832
Book series with college students finding a way to open portals to other planets
56157
SciFi novel about a vault on the Ocean floor
51376
1970s (?) sci-fi book based on Hinduism/Buddhism
18858
Looking for a childrens book from the 70s about kids that build a spaceship
31406
Short story about genius kids who disappear and run into trouble in another dimension?
105120
Older fantasy novel with alternate world and musical themes
128624
Trying to remember the name of a grade-school book about an alien in a cereal box
62193
Trying to find a book about rediscovered space travel after interstellar war isolates planets
142054
Seeking title / author of a story about alien first contact with Earth