A Great Resource 

I found this visual recently, and thought it a great resource to publish.  And to think, that I only knew one type of cast on for many many years!


After seeing this chart, a quick google search led me to these 2 books that I had not previously known about.  I have ordered them from the library to see if they are a good resource to have in my own personal library.  Will review both when I have them in hand.