Dana,

The Book of Oliver was a sizable book put out by Oliver during the 1930s. Each book had descriptions and pictures of virtually every product that Oliver had for sale at the time. There were 3 volumes, with updated information in each one, and discontinued models removed as time went on. They aren't impossible to find, but are rare enough that they will fetch $300 - $400 for ones in good condition, and even higher if it is one of the leather bound editions. You can occasionally find one on ebay, that's where I bought my copy of volume 2.  I also found your plow in the Volume 2, and it sure looks like what they called the 8-Axx, with the xx being replaced by other letters, depending on what options were ordered with the plow. I have scanned the page, and will post it on the forums with your post, so that others might be able to glean something from it as well.

Hope this helps.