I did go ahead and pull the trigger on the eBay purchase for Leo J. Scanlon’s “6502 Software Design” even though I won’t need it for awhile. These older programming books are either getting harder to find or they are getting more expensive and/or not great condition when they are found. This is a Third Printing of the First Edition (1980).
Purchasing this book should conclude what I need for my path to “learning the 6502 bit by bit” even though it won’t be read until much later in the journey.