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Aug. 21, 2018
August 2018 Puzzle Periodical - Crop Calculations
NSA Puzzle Periodical for August 2018: Crop Calculations
March 20, 2018
March 2018 Puzzle Periodical - a, b, c - Variable Alphabet Equation
March 2018 NSA Puzzle Periodical - a, b, c - Variable Alphabet Equation by Wendell W.