Perchlorates -- Electric properties. / https://id.loc.gov/authorities/subjects/sh89001746 https://id.loc.gov/authorities/subjects/sh00005855 : Bergmann, M. E. Henry,
Perchlorates -- Law and legislation -- United States. / https://id.loc.gov/authorities/subjects/sh89001746 https://id.loc.gov/authorities/subjects/sh99004848 https://id.loc.gov/authorities/names/n78095330-781 : United States.