1. Pure Royal Pepsin: no patents! no lawsuits! no rotten peptones! no insoluble scales! Publication: [Pittsburgh, Pa.?] : [publisher not identified], [1893?] Subject(s): Pepsin AGastrointestinal Agents
2. Notes on Finzelberg's pure soluble pepsin (1 to 100): prepared exclusively by H. Finzelberg's Nachfolger, Chemical Laboratory, Andernach on the Rhine Publication: N.Y. : L. Boeker, druggists' printer, [1881?] Subject(s): Pepsin AGastrointestinal Agents
