{
   "title": "Masses and Mainstream",
   "preceded-by": [{"id": "newmasses", 
                     "note": "New Masses"}],
   "first-issue": {"issue-date": "1948-03", "volume": "1", "number": "1"},
   "first-renewed-issue": "none",
   "first-renewed-issue-source": "cce+database",
   "first-renewed-contribution":
     {"issue": {"issue-date": "1950-07"}},
   "first-renewed-contribution-source": "1977-JulDec",
   "last-issue": {"issue-date": "1956-08", "volume": "9", "number": "7"},
   "succeeded-by": [{"id": "mainstream1956", 
                     "note": "Mainstream (1956-1963)"}],
   "responsibility": {
      "authorized": "Mark Ockerbloom, John, 1966-",
      "contact": "ockerblo@pobox.upenn.edu"
   },
   "last-updated": "2019-04-26"
}