Books like Young Extraterrestrials
Isaac Asimov, Martin H. Greenberg, Charles G. Waugh, Keith Laumer, Lloyd Biggle Jr, Piers Anthony, Eric Frank Russell, Frank Belknap Long, R. A. Lafferty, Jesse F. Bone, Edward D. Hoch, Zenna Henderson, Murray Leinster, James E. Gunn
Young Extraterrestrials is 224 pages, about 4 hours 6 minutes at 250 words a minute.
12 books to read next
How long each takes
Dragons at Crumbling Castle 6.5 h 
The Wonderful Story of Henry Sugar and Six More 4.2 h 
My Teacher Is an Alien 2.3 h 
The Secret 2.9 h 
Adaptation 7.8 h 
Scythe 8.2 h 
Star Wars 2.5 h 
Star Wars 1.8 h 
Armageddon 5.7 h 
Zita the Spacegirl 3.3 h 
Prisoner of the Ant People 2.1 h 
The Separation 2.9 h Bar height shows length. Estimated at 250 words a minute.