The article "Unsolved Problems" in the February 1973 Word Ways posed the problem of constructing a tautonymic 10-by-10 word square consisting entirely of words, names and terms taken from books published since 1950. Dmitri Borgmann and I joined together for three months during the spring of 1973 to search for a sufficient number of tautonyms to make the construction of such a word square possible. Originally, we thought that at least 1000 tautonyms would be needed, but we were able to compose two 10-by-10 squares from a list of only 350 tautonyms.
"A Ten-Letter Tautonym List,"
Word Ways: Vol. 15
, Article 13.
Available at: https://digitalcommons.butler.edu/wordways/vol15/iss4/13