Big universities and small LACs do vary considerably in H/SS general education requirements. For example, Brown and Amherst have none (except for ABET-accredited engineering majors at Brown), while MIT and Harvey Mudd have extensive H/SS general education requirements.
Smith College actually has minimal general education requirements, but to graduate with Latin Honors or Liberal Arts Commendation, a student must complete the pattern described at http://www.smith.edu/academics/guidelines-and-procedures/curriculum . This pattern (with at least 24 credits in H/SS courses) is also required for engineering majors.
Mount Holyoke’s general education requirements are listed here with its overall bachelor’s degree requirements: https://www.mtholyoke.edu/registrar/ab .
Bryn Mawr’s general education requirements are listed here with its overall bachelor’s degree requirements: http://www.brynmawr.edu/deans/four_year_pic/coll_degree_reqs.shtml