The Pharmacopoeia of the United States of America: (The United States Pharmacopoeia). By General Medical Convention, United States Pharmacopeial Convention Committee of Revision, United States Pharmacopœial Convention, General Convention for the Formation of the American Pharmacopoeia, National Convention for Revising the Pharmacopoeia Published by United States Pharmacopoeial Convention, Inc., 1820-1975., 1820