1. Sandwich mineral springs Author(s): Duffield, Samuel P., author Publication: [Sandwich, Ontario?] : [publisher not identified], [1869?] Subject(s): Mineral Waters -- analysisMineral Waters -- therapeutic useNatural Springs -- analysisBalneologyOntario
2. On the medicinal fluid extracts Author(s): Duffield, Samuel P., author Publication: Detroit : Daily Post Book and Job Printing Establishment, 1868 Subject(s): Plant Extracts -- administration & dosagePharmaceutical Solutions