Richard Friedberg wrote a column in Linn's Stamp News about U.S. Revenues for nearly
twenty years; his book, Introduction to United States Revenue Stamps, is an updated compilation of many of those columns.
Richard was the president of the American Revenue Association for four terms between 1986 and 1994. He has written other articles
and studies that have appeared in leading philatelic publications. Additionally he has written several major revenue sales
for auctions houses; among them are the Joyce Match & Medicine Sale, and a large portion of the Weill Brothers revenue
holdings (Christies, 1989).