"The use of seasonality in the cash and futures markets is not a new concept. Since the early 1970s various books, studies and trading systems employing seasonal techniques have been published. In 1977 I published Seasonal Chart Study 1953-1977: Cash Commodities. This was one of the first detailed studies that attempted to quantify seasonals in the commodity markets. Shortly thereafter I published Seasonal Chart Study II - Commodity Spreads that provided a week by week seasonal analysis of commodity spreads and isolated many highly reliable seasonal patterns. This report has since been expanded, updated and published as Jake Bernstein's Daily Seasonal Spread Charts (1990 John Wiley and Sons, Publishers)."