Mrs John Murphy said:They will also have a large collection of European and North American newspapers/magazines. So if you need a hard-copy of any magazine that would be the place to start. If you are in the US then the place to look would be the Library of Congress.
Or any Legal Deposit Library:
http://en.wikipedia.org/wiki/Legal_deposit
They're useful places, and like I said, I work at one so I can put in a request Tuesday morning for Winning and likely get it by lunch time.
What exactly do you need from it? I can probably get a photocopy, but would a scanned photocopy of a defunct(?) magazine suffice as a suitable reference?