The metric system and the historical record.
HERVEY
G W
GW
D064751:Ammonium Compounds; D000890:Anti-Infective Agents; D008792:Metric System; D000644:Quaternary Ammonium Compounds; D011996:Records; D012492:Salts; D014894:Weights and Measures
D064751:Ammonium Compounds; D000890:Anti-Infective Agents; D000644:Quaternary Ammonium Compounds; D012492:Salts