If you havent already seen this post in this thread, I would be extremely interested in this post in this thread in case you missed it.
http://history-sites.com/cgi-bin/bbs53x/cwnavy/webbbs_config.pl?read=61
Also the link below would be one I would search under advanced search and limit it to your year range, not by place, to see if you find anything. One thing though is the site below has had a lot of bad feedback. My experience is, that if youre literally trying to find everything, I would try it. The downside I believe is that it is you that must cancel the subscription rather than it set to run out after a period of time.
http://www.newspaperarchive.com/
http://www.newspaperarchive.com/TermsConditions.aspx under 2.5 Cancellation
I think I used to cancel right before the agreement ran out so I wasnt charged for the next span.
I hope this helps,
Bobby