Introduction and Summary to "Econometric Models of Cyclical Behavior, Volumes 1 and 2"

Bert G. Hickman, Econometric Models of Cyclical Behavior, Volumes 1 and 2 (NBER, 1972), https://www.nber.org/books-and-chapters/econometric-models-cyclical-behavior-volumes-1-and-2/introduction-and-summary-econometric-models-cyclical-behavior-volumes-1-and-2.