Alfred North Whitehead books in order
9 books in the catalogue, about 50 hours of reading in all; the shortest takes 2 hours and the longest 10 hours.
9 standalone books in the catalogue.
Standalone books
Principia Mathematica 7.5 h 
An Introduction to Mathematics 4.7 h 
The Concept of Nature 3.7 h 
Science and the Modern World 4.9 h 
Symbolism 1.6 h 
Process and Reality 10.0 h 
Adventures of Ideas 5.6 h 
Modes of Thought 4.4 h 
Process and Reality (Gifford Lectures Delivered in the University of Edinburgh During the Session 1927-28) 7.6 h