https://www.erowid.org/references/refs_view.php?ID=1121&S=legal&SField=all
Erowid.org: Erowid Reference 1121 : Retrospective analysis of some L-methamphetamine/L-amphetamine...
The Index page for the reference article: Hornbeck CL, Czarny RJ Retrospective analysis of some L-methamphetamine/L-amphetamine urine data J Anal Toxicol 1993...
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