Older DA PAM 670-1?

I've managed to collect PDFs of every edition of AR 670-1, the uniform regs, going back to the first edition in 1981. (Before that, there was AR 670-5 for male uniforms and 670-30 for female uniforms.) I'm having much more trouble finding the associated DA PAMs, which are actually much more useful in showing how items were worn. I have the 2014, 2015, 2017 and 2021 (current) editions but can't find anything older.

Any suggestions on where I'd find them?

I'd especially like to get the 1981, 1986, and 1987 editions since they were in effect during my time. (A September 1992 edition came out shortly after my ETS.)