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  1. pdf2017MeshTreesWithChangesShown.pdf 
    https://www.nlm.nih.gov/.../2017MeshTreesWithChangesShown.pdf
    ... Penicillins Amdinocillin Amdinocillin Pivoxil Cyclacillin Methicillin Nafcillin ... Penicillin G Procaine Sulbenicillin Penicillin V Sulbactam Ticarcillin ...
  2. NLM Digital Collections - Cumulated list of new medical subject headings, 1963-1973 
    Publication: [Bethesda, MD] : U.S. Dept. of Health, Education, and Welfare, Public Health Service, National Institutes of Health, [1973]
    resource.nlm.nih.gov/0364631
    ... with Year of Action 1963 PENICILLIN.................................................................................. PENICILLIN G, BENZATHINE .963 ... ...
  3. pdf2016MeshTree.pdf 
    https://www.nlm.nih.gov/mesh/2016/download/2016MeshTree.pdf
    ... Oxacillin D02.065.589.099.750.625.150...........................................Cloxacillin D02.065.589.099.750.625.150.205........................................... ...
  4. 2019New_Mesh_Tree_Hierarchy.txt 
    https://www.nlm.nih.gov/.../download/2019New_Mesh_Tree_Hierarchy.txt
    ... Oxacillin D02.065.589.099.750.625.150 Cloxacillin D02.065.589.099.750.625.150.205 ... 065.589.099.750.750.685 Penicillin G Benzathine D02.065.589.099.750.750.695 Penicillin ...
  5. Drugs and Lactation Database (LactMed®) - NCBI Bookshelf 
    https://www.ncbi.nlm.nih.gov/books/NBK501922
    ... Clomiphene Clomipramine Clonazepam Clonidine Clopidogrel Clorazepate Clotiazepam Clotrimazole Cloxacillin Clozapine Coagulation Factor IX Coagulation Factor X Coal ...