One of the early indexes published by SMCGS is the San Mateo Times Gazette Index 1859-1899 compiled by Mary Lou Grunigen.
There are two parts to this index, which was originally published in 1996 in book form. The first part is an index to vital records (births, marriages, deaths, probates, etc.) for the first forty years of this early publication.
The second part is an every name index to the paper from 1859-1867. Here you might find entries for tax lists, memberships to social institutions, crime reports and much more.
The printed publication, like all SMCGS publications has been digitized and is available for public search on the SMCGS website.