150 puzzles in crypt-arithmetic.
Brooke, Maxey.
150 puzzles in crypt-arithmetic. - 2d rev. ed. - New York Dover Publications [c1969] - 72 p. 22 cm.
0486210391
71010736
Puzzles.
GV1501 / .B7 1969
793.7/4
150 puzzles in crypt-arithmetic. - 2d rev. ed. - New York Dover Publications [c1969] - 72 p. 22 cm.
0486210391
71010736
Puzzles.
GV1501 / .B7 1969
793.7/4