Michael, I've never had much more than a passing interest in photographic microstructure because I always thought that without a microdensitometer it was mostly theoretical. Henry's coverage of the subject; however, does look useful as he discusses a hands on approach. Another nice book is Image Clarity: High Resolution Photography by John B Williams. I've found it to be very accessible. If you want to get into the weeds of the equation, Theory of the Photographic Process 3rd edition, Chapter 23 -The Structure of the Developed Image, The Imagery of Points, Lines, and Edges. I'm afraid you're on your own with that section.

BTW, how do you plan to work around not having a microdensitometer?