Free to use images are located in the albums below. These are digitised images mostly from teaching slides, I took some time ago. They are free to download and use for personal or educational use without acknowledgement.
If included in publications, I wave a copyright fee but expect acknowledgement of copyright ownership © Ritchie Cunningham.
If you want to keep these resources available and growing, Please buy one of my books or donate to my gofundme page https://gofund.me/f16daa86