ITA reading method

I was taught to read by the ITA method, in 1965. I wondered if anyone knows where I can purchase the first set of the Paul and Sally books. I also remember getting books from the "weekly readers ". I had several but they were destroyed in our house fire many years later. No one seems to know what I am talking about.

I googled it, and up popped this 2012 discussion: http://talk.collegeconfidential.com/parent-cafe/1298959-anybody-else-taught-how-to-read-using-ita-initial-teaching-alphabet.html

There seem to be a few “Paul and Sally” books available on abebooks.com.