This was based on intuitive supposition, and the OFA even made statements to the effect that they were true concepts (Reed & Keller,
undated brochure, approx 1999 - 2000; and Canine Practice 1993, volume 18).
This undated brochure highlights findings from Doug Achterman's dissertation, Haves, Halves, and Have - Nots: School Libraries and Student Achievement in California, and Scholastic's School Libraries Work!