Reproduced below is one version of a nine-by-nine word square the Darryl H. Francis presented in the May 1981 issue of Word Wyas. It was a revised form of one orignially constructed by Palmer Peterson, one of the great formists of the National Puzzlers' League, and perhaps an improvement on the original.
Borgmann, Dmitri A.
"The Terre Hall Mystery,"
Word Ways: Vol. 19
, Article 14.
Available at: https://digitalcommons.butler.edu/wordways/vol19/iss1/14