Here are two books and a wheel calculator for using the Zone System.
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If you ever wondered how Ansel Adams, Minor White, and others achieved their incredible Black & White prints, this is it.
The yellow book is a reprint of the original book, written by Minor White.
The blue book was the "classic" book for the utilization of the Zone System.
Classic books. In good condition, but a little worn from being old. The wheel calculator appears to not have been used -- the original stickers are still there, unused.
A great addition to your B&W photo knowledge.