San Gabriel, E.E. Clark, (n.d., ca. 1920). one folio leave (35 x 22 cm.), twice folded.
In this catalog Clark offered about 250 formulas, tests, prescriptions & medical treatments. "With one or more of these formulas, a profitable business can be established. Several nation-wide concerns had their beginning in the home kitchen less than 10 years ago, and fortunes were made".