21. Circular to one of the trustees of the University of Pennsylvania Author(s): Barton, William P. C. (William Paul Crillon), 1786-1856 Publication: [Philadelphia? : s.n., 1825?] Subject(s): Education, MedicalBotanyCurriculumPhiladelphiaUniversity of Pennsylvania. Department of Medicine.
22. A flora of North America: illustrated by coloured figures, drawn from nature Author(s): Barton, William P. C. (William Paul Crillon), 1786-1856 Publication: Philadelphia : M. Carey & Sons, 1821-23 Subject(s): PlantsNorth America