How did Michael get his books? Did Michael have contact with other pedos?

Surely these books with child nudity are extremely hard to find nowadays, but the big question is: how hard was it back then?

How much contact with NAMBLA and other groups did Michael have? Of course, he was a superstar with unlimited access, but how did he know where to buy? How far was he into this culture? There is no way he just came across it, the research must have been big.