Help Identify Youth novel about higher dimensions
110960
ID a book about a mirror world and 4th dimension
88948
Young adult book about experiment on teens in a big room with shifting platforms
112532
Short story about a hole to another universe that pulls in metal
51562
Need help identifying the fantasy book about a portal to a fantasy land in the basement of a house
141480
Help identifing a book about people exiled to the distant past
49927
Trying to remember a book that had people (I think they turned white?) segregated into a compound
80103
Trying to identify a book about life on the side of an infinitely tall wall
18199
Looking for sci-fi novel I read about humanity finding alien station on orbit of Earth
102575
Sci-fi book with HUGE trees and catlike people
121599
Short story about a gigantic space monster that is big enough to cover half of the Earth
18858
Looking for a childrens book from the 70s about kids that build a spaceship
85196
1970's sci-fi short story in 4th grade reading anthology
116839
Novel about alien species made of gas rings?
128624
Trying to remember the name of a grade-school book about an alien in a cereal box
25210
Science fiction short story taking place in a universe with a higher gravitational constant
53781
Looking for a classic sci-fi short story about a boy who discovers pods growing in a field
148604
Name the book where the setting is a giant ship with a planet inside