Creating a 21st Century Collector's Guide to 1898 Documentary Printed Precancels: The Bureau Specialist from November 1946

R. A. Bryant, in the November 1946 edition of The Bureau Specialist, wrote a short article referencing Chappell's 1942 list in the Weekly Philatelic Gossip.  The article sheds a bit of light on the philatelic discovery process, as it notes that Chappell listed no printed precancelled 10 cent battleships, and that subsequently, by 1946,  two had shown up: in particular, stamps cancelled by the Chicago, Milwaukee & St. Paul and another cancelled by the International & Great Northern.  The collector Gilmore Martin reported that a collector in Missouri had an export bill of lading with the I&GNRR 10c stamp.  The tax on an export bill of lading was ten cents.  

Curiously Richard Fullerton in 1952 did not list the International & Great Northern 10 cent stamp.  So despite a quite reliable report of the existence of the I&GNRR cancel, Fullerton either did not know about or chose not to list the stamp and cancel.