Here’s another situation where I was working on genealogy stuff and happened upon something lighthouse related.

My relatives are at the top of this page from the Portsmouth City Directory from 1933 but I immediately saw the USLS (United States Lighthouse Service).

More can be found about Holder Almy at the United States Lighthouse Society’s J. Candace Clifford Lighthouse Research Library: https://archives.uslhs.org/type-person/engineers