In "Cracking the Pi-Code" in the November 1999 issue of Word Ways, David Morice discussed the recreation of looking for words in the decimal digits of pi (3.14159265358979...) with the 10 digits replaced by some set of 10 different letters, as in a substitution cipher.
"Further Cracks in the Pi-Code,"
Word Ways: Vol. 33
, Article 11.
Available at: https://digitalcommons.butler.edu/wordways/vol33/iss1/11