Franklyn M. Branley books in order
11 books in the catalogue, about 8 hours of reading in all; the shortest takes 34 minutes and the longest 2 hours.
11 standalone books in the catalogue.
Standalone books
Mickey's Magnet 52 min 
Solar Energy 2.2 h 
The Moon Seems to Change 35 min 
The Sun 35 min 
What Makes Day and Night 35 min 
What the Moon Is Like 34 min 
Gravity Is a Mystery 36 min 
Sunshine Makes the Seasons 36 min 
The Planets in Our Solar System 35 min 
The Sky Is Full of Stars 37 min 
What Makes a Magnet? 35 min