PERSI is THE master index for periodicals with over 2.5 million entries. Thousands of magazines, newsletters, journals, and other periodicals from the U.S., Canada, Britain, Ireland, and Australia are indexed here.
PERSI is maintained by the Allen County Public Library’s Genealogy Center in Fort Wayne, Indiana. They have the equivalent of 6 full-time staff who are dedicated to subject-indexing every issue of every known genealogy or historical periodical and even the tiniest society newsletter.PERSI is currently available at the FindMyPast website - but the good news is that you don't need a subscription to search the database. Yeah - I know - something for free.
Lisa Louise Cooke's blogpost explains PERSI and how to use it. Hope you will take a moment to check it out!