33,000 Marriages in Lake County, Indiana

That's the gift to researchers from the Northwest Indiana Genealogical Society. The index is unusually comprehensive, including the name of the marrying official (and religious denomination when available), and of course a link to order the original document to be sure everything is well transcribed. Indexing, a major volunteer project coordinated by Marlene Polster, is ongoing, as they are up to book 23 (which includes marriages from 1914) but aiming for 1920 (books 40-41). Hat tip to the Indiana Genealogical Society blog, which keeps up with lots of local events and queries that I don't, so you should go there!