Larry Gonick books in order
10 books in the catalogue, about 48 hours of reading in all; the shortest takes 4 hours and the longest 7 hours.
10 standalone books in the catalogue.
Standalone books
The Cartoon History of the Universe 5.6 h 
The Cartoon Guide to Genetics 4.0 h 
The Cartoon Guide to Physics 3.9 h 
The Cartoon History of the United States 7.2 h 
The Cartoon Guide to Statistics 4.2 h 
The Cartoon Guide to Sex 4.5 h 
The Cartoon History of the Universe III 5.5 h 
The Cartoon Guide to Chemistry 4.6 h 
The Cartoon Guide to Chemistry (Cartoon Guide To...) 4.6 h 
The Cartoon Guide To Calculus 4.4 h