Hello,
I just received the Spring 2018 issue of "The Reel Image" issued by Steve Osborne. There were several interesting articles--including one by Martin Dew about the Eumig Museum (Part I). Dino Everett also wrote an article about David Shepherd of Blackhawk Films and the numerous catalogs that have been scanned and are now freely available online.
Here is the link for the Blackhawk catalogs: http://uschefnerarchive.com/blackhawk-films-catalogs/
There are over 380 catalogs/sales bulletins totaling more than 16,000 pages!
Truly amazing how many films were available through Blackhawk over the years.....