Published: Merck & Company, <1950- >; Merck Sharp & Dohme Research Laboratories, <1972- >; Whitehouse Station, NJ : Merck Research Laboratories, <1999- >
Vol. for <1999> accompanied by facsimile first ed. entitled: Merck's 1899 manual of the materia medica.
Vols. for <1982- > also published as a two vol. set.
Latest issue consulted: 18th ed. (2006)