Happy enough to have found 10- and 11-squares, I then heard with a sense of foreboding that Ross Eckler was retiring as editor. With more time at his disposal, perhaps he would pre-empt my discovery of the twelve square, an object which I can scarcely believe is possible (It requires about four million 12-letter words). I fear to lose my reputation as the guru of large squares.
Word Ways: Vol. 40
, Article 7.
Available at: https://digitalcommons.butler.edu/wordways/vol40/iss1/7