All 79 issues of The Masses, from January 1911 to November/December 1917, are now available on the MJP website, and the MJP’s datafiles for The Masses are also now available in the MJP_Lab‘s Sourceforge repository. Please note the peculiar numbering of the original issues of the magazine: volume 2 does not exist, while volume 3 consists of just six issues and volumes 7 and 10 consist of only one issue each.