Maybe you misunderstood me. What I meant was that they were still controlled, prescription drugs during that time. They weren't available over the counter.

You article supports that with the quote: "mainly iatrogenic"

Amphetamines were available over the counter until the 70's, no prescription required. Did you read the article?

I did read it, from what I saw the Benzedrine inhaler was available until the 1950s, not the 1970s.

That was one source of amphetamine that wasn't tightly controlled. The rest of it was prescription only. In fact, "In 1959, the United States Food and Drug Administration (FDA) made it a prescription drug."