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NAWCC Disc and pics

Eleven of these numbers were published by Kent Singer and Ed Ueberall on p 623 of NAWCC Bulletin 340 and a twelth example was listed in Bulletin 341
Additional info was gotten from Bulletin 351, pp 494-499, an article by Harold Visser and Clint Geller

Where I was able to document an earlier source,I did so.
The remainders came from postings on the internet attributed to the various individuals.
PI is shorthand for Roy Ehrhardt's Price indicators and preceded by the year.