The Home & Garden section of the Atlanta Journal and Constitution published a very nice pruning calendar several years ago.
When viewed on a sheet of newsprint, it was gorgeous. When reduced to fit onto a sheet of typing paper it was impossible to read.
I imagine you didn’t keep the calendar tacked to your shed wall, did you?
I have the AJC calendar here.
I also have my original file here.
I think you’ll find that my file, while not as pretty, is more readable.
Also see Good Books on Pruning.