When did gestational diabetes become a diagnosis?

Can you answer Mindy’s question about Diabetes?:

I am trying to find out more about the history of gestational diabetes. I am finding plenty of articles about people having a personal or family history of it, but what I am looking for is when the medical community starting using the phrase “gestational diabetes” rather than only talking about diabetes and pregnancy. I found an article from 1986 in a medical journal that mentions it, but nothing before that.

Does anybody know where there might be more information about this?

Treatment For Type 1 Diabetes