There are some references available for cancels on the 1898 proprietary revenues:
The Battleship Desk Reference by Giacamelli & Mustacich. It is available from both Richard Friedberg and Eric Jackson:
http://www.friedbergstamps.com/id19.htmlhttp://www.ericjackson.com/rDetails...4576&this=itThe BDR is also searchable online:
http://www.battleship-revenues.com/index.phpAdditionally, there was a "book" put out by the ARA some years ago called Proprietary Revenues of 1898 Precanceled Varieties by Chappell. It is a bit harder to find but both Eric and Richard have had it in stock in recent years.
Also, the 1898 Revenues site has some good information:
http://1898revenues.blogspot.com/?m=1