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It hard to even find stuff from the 90's.
Back in the day, before the internet...
Contact Rick in Kansas, he may be able to get some back issues of some of the old mags.
As Chuck said, tournament results were printed in the Disc Golf World News (DGWN). The PDGA has every issue of the DGWN at the IDGC library. If you know the name and date of a specific event, you can email a request for a copy of the tournament results from DGWN. The PDGA staff always been very helpful when requesting articles and results from past issues.