I don't know all the details, but this is the situation as I understand it...
The historian stuff is mostly photocopies, or photocopies of photocopies. I do not believe the WCHA owns any original catalogs of its own. As one of the historians, I was told on receipt of the material that we were not supposed to make copies, the reason, as Benson said, was something to do with fear of violating copyright issues. A non-issue in my opinion for most if it, but there you are. For more details about this I suggest you contact Al Bratton directly, as he is in charge of the Historian group and those materials. His contact information can be found in the masthead of the Journal.
The WCHA does own a collection of old canoeing books. These were originally held by the WCHA Librarian (the last one was Dave Baker). They were made easily available (along with a photocopier) to the membership at an assembly a few years ago, and subsequently deposited at the Adirondack Museum under special agreement. Not necessarily easy for all to get to, but they are available there. I do not recollect any original manufacturers catalogs being part of that collection.
As for the WCHA reprinting an English catalog, or any other for that matter, there has been no discussion of this recently. I spoke with Dave Baker a few years ago about this and we bantered about a few ideas of what would make a good addition to the reprint library. Nothing came of this before Dave passed away. If this is something the members want the board to consider, then the members should let the board know. Again, all the contact info is in every journal.
William English catalogs are not common at all. Apart from the poor quality photocopies in the Historian collection, I do not know of anyone possessing one. Not one has appeared on Ebay in the last five years. If one were to become available to me somehow, you can be assured it will appear on our Canadian CD.
The only other suggestions I can offer is to contact the Canadian Canoe Museum or Roger MacGregor. Given Roger's track record in reprinting Canadian company catalogs, he is probably the most likely to produce a reprint. Let him know you want one...
Cheers,
Dan