Merck

Do you mean:

Merck KGaA, the German pharmaceutical company;
Merck & Co., Inc. (aka Merck Sharp & Dohme), the U.S. pharmaceutical company spun off from the german Merck KGaA
the Merck Manual, a textbook published by Merck & Co.
the Merck Index, an encyclopedia of Chemistry, published by Merck & Co.

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