Mancall, Peter C. (contributor); … - 2008
ports. The extent of this limitation is clear in data collected in the American Inspector
General’s Ledgers for 1768-1772 … establish the annual average value of commodity exports in
the years 1768-1772 from New York and Philadelphia to each of the … derived
tonnage by assuming that the value per ton was constant and equal to its value in the base
years, 1768-1772.
20 …
