The authors "did their best" to find 28 gauge, 8 gauge, and high grade guns as they scanned the order books. However, they probably missed a few. The stock books were easier to negotiate, with more legible content. They probably didn't miss anything in the stock book entries. The main intent of the authors was to list stock book entries. The original PGCA research committee completed the copying of the order books, but did not compile any production totals.
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