In the November 1972 issue of Word Ways, Darryl Francis listed the lightest and heaviest words (assigning A = 1, B = 2, etc.) of lengths up to, and including, 15 letters. Some 23 years later, in the August 1995 issue. Leonard Gordon responded to Darryl's suggestion of 1972 that "Perhaps some enterprising Word Ways readers would like to extend our work, investigating words with more than fifteen letters by repeating the exercise for words of 16 to 24 letters. He also improved two of Darryl's original examples.
"New Lighweights and Heavyweights,"
Word Ways: Vol. 28
, Article 26.
Available at: http://digitalcommons.butler.edu/wordways/vol28/iss4/26