Castor fiber L. Engl.: European beaver. Pharm.: castoreum.
Classic texts: The American Eclectic Dispensatory, by John King, 1854.
Classic texts: Journals: AJP 1881.
Classic texts: Sayre 1917.
Classic texts: Cook 1869.
Classic texts: BPC 1911.
Henriette's herbal is one of the oldest and largest herbal medicine sites on the net. It's been online since 1995, and is run by Henriette Kress, a herbalist in Helsinki, Finland.