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The Merck Index, the first edition of which appeared in 1889, now covers more than 1,000 pages, twice the number of the previous edition, which was published in 1930. It is definitely swelling by accretion. It offers as one of its new features "Chemical, Clinico-Chemical Reactions, Tests and Reagents by the Author's Name" (350 pages). Many of these references have only historical value. However, the volume contains much valuable information.
The Merck Index. Fifth Edition. Arch Derm Syphilol. 1940;41(1):188. doi:10.1001/archderm.1940.01490070191023
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