Canfield systems
The Canfield Expert system is in his book, "Blackjack Your Way to Riches". It is a good single level count, but requires a side count of aces, which turns some counters away. It has an efficiency a bit higher than hi-lo.
The book offered the Master system for around $200-300 as best I remember. This system is the same as AOII, is a valid, strong, 2 level count, but a rip off at that price.
The book was one of my first reads simply because it was the one my local bookstore happened to have on the shelf, and I had never heard of Wong, Snyder, et al at the time. It is a very interesting read with the sidebars, contains proper basic strategy, a valid system, but does contain the typical poor risk management of most 70's books. The bet sizing/BR advice is a bit risky by most serious players standards of today.
Last I heard, which has been some time ago, Richard Canfield was teaching a BJ school in NV, and it seems it was in Reno.