Just accessed the entire series of the Transactions of the Baptist Historical Society volumes from 1908–1921 at BiblicalStudies.org.uk. You can work with the individual articles or download the entirety as a .zip file containing all of the .pdfs and an index. The download is big (65 MB) but worth the time and effort. For Baptist historians it is like gold as it contains a lot of primary sources docs. Thanks to Rob Bradshaw for doing this.
HT: Sean Winter.