The Boston Latin School Association of Harvard University, also known as the Harvard Boston Latin School Association or H.B.L.S.A., was founded in 1894. (An organization of the same name existed from 1891-1892; it is unclear whether the two have any connection.) The Association consisted of Harvard students who were also alumni of Boston Latin School, and was a social organization. The Association was probably connected in some way with the Boston Latin School Association.
From the description of General information by and about the Boston Latin School Association of Harvard University, 1896. (Harvard University). WorldCat record id: 228511376