In these reports there is a tendency for certain periods of cycles to be reported more commonly. These common periods include the underlined periods above and some other periods such as 9.6 years, found in the 9.6 year cycle of lynx abundance and 3.39 years (40.68 months), found in the US stock market, which Dewey says is the most commonly found period. Dewey further said that:  In 1947, Dewey and Edwin Franden Dakin published their book "Cycles: The Science of Prediction" which argued the United States economy was driven by four cycles of different length. Robert Gale Woolbert wrote that they "adduce interesting second-hand statistics to the effect that cyclical tendencies have been observed in industrial, biological and solar phenomena." Milton Friedman dismissed their theory as pseudoscience:  ["Cycles: The Science of Prediction"] is not a scientific book: the evidence underlying the stated conclusions is not presented in full; data graphed are not identified so that someone else could reproduce them; the techniques employed are nowhere described in detail. Its closest analogue is the modern high-power advertisement—here of book length and designed to sell an esoteric and supposedly scientific product. Like most modern advertising, the book seeks to sell its product by making exaggerated claims for it [...], showing it in association with other valued objects which really don't have anything to do with it [...], keeping discreetly silent about its defeats or mentioning them in only the vaguest form [...], and citing authorities who think highly of the product. John Brookes describes Dewey's attitude to the business cycle:  Murray Rothbard critiques Schumpeter’s and Dewey's approach in "Man, Economy, and State": and in "America's Great Depression":  The Foundation for the Study of Cycles (FSC) is an international non-profit research organization for the study of cycles of events. It was incorporated in the State of Connecticut by Edward R. Dewey in 1941 and is currently under the directorship of Dr. Richard Smith.