Henry Burger's The Wordtree, a 28-year labor of love privately published in August 1984 at 7306 Brittany, Merriam KS 66203 and available from him for $149, is a reference book based on a novel idea: that one can express any transitive verb as the sum of exactly two other transitive verbs, as RAP = HIT + INTERRUPT, or VIBRATE = HANG + WAG. The core of his book consists of a 130-page Hierarchy, in which 24,600 transitives are listed and related to each other according to equations of this nature.
Eckler, A. Ross
"A New Type of Reference Work,"
Word Ways: Vol. 17
, Article 12.
Available at: http://digitalcommons.butler.edu/wordways/vol17/iss4/12