Add to that the surprisingly tough nature of this book. It's seldom offered to us in collections of the period. The off-white cover shows wear and dirt very easily.
Take advantage of the relatively small number of transactions to snap up a clean mid-grade copy of this book. Sales data show that the prices seldom vary much between true mid-grade (5.0) and 6.5.
If you can find one at that grade, take it. The jump in price to 7.0 and beyond is significant.
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