I believe I learned the same one as you, probably when I was around 12. I have no idea where I got it from. That would have been in the early '70s, and I was mo

I believe I learned the same one as you, probably when I was around 12. I have no idea where I got it from. That would have been in the early '70s, and I was mostly learning from books from Radio Shack and the public library and from Popular Electronics magazine.