In addition to being the past president of the American Canal Society and author, David Barber was also the man behind the Blackstone Canal Conservancy. In his computer files, I found the following issues of The Prism which was the newsletter of the Conservancy. I tried looking this up and can’t find any current mention of the publication on the web. As these start with issue 45, June 2014, and go up through his death with issue 56, December 2016, there had to be another 44 issues out there.
I found the Blackstone Canal Conservancy on the Wayback Machine at www.blackstonecc.org. Sadly, the links no longer work.
Issue 45 June 2014 Issue 48 December 2014 Issue 49 January 2015
Issue 50 March 2015 Issue 51 July 2015 Issue 52 October 2015
Issue 53 November 2015 Issue 54 April 2016 Issue 55 July 2016