Records & photos · Other documents
Massachusetts year book and business directory (1899), p. 772: under Merrimac, "Photographer - Herbert C. Oak."
Document · dated 1899 · source: Internet Archive (public-domain scan); massachusettsyean5p2worc.

How it is shown: Complete page extracted from the scan as a one-page PDF; no crop, no retouch, no search highlight.
Keep in mind: Confirmed that the directory lists Herbert C. Oak as photographer in Merrimac in 1899. It does not expand the middle initial.
Evidence for
- Massachusetts year book and business directory of every town and city in the state · the original at F. S. Blanchard & Co., Worcester. Internet Archive scan contributed by Allen County Public Library Genealogy Center.