Martin Gardner wrote 111 puzzles for his good friend Isaac Asimov to include in Isaac's Science Fiction magazine. The popular Sci-fi paperback is still being published. For details contact the editor Sheila Williams.
"Collector's Corner, Round 6,"
Word Ways: Vol. 44
, Article 17.
Available at: https://digitalcommons.butler.edu/wordways/vol44/iss3/17