I don't know how they were distributed....whether by subscription or just for sale locally on campus to students and professors. I once made contact with a professor at Syracuse University who had a copy. I offered him $400 for it but he refused my offer. I was extremely fortunate to see one listed on ABE several months later for $20 or so in 2010. I consider it one of my best and luckiest finds. Ari did have similar luck a few months ago.