| MEDLARS | Medical Literature Analysis and Retrieval System |
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| AIDSDRUGS | clinical trials of acquired immunodeficiency drugs [MEDLARS data base] |
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| AIDSLINE | on-line information on acquired immunodeficiency syndrome [MEDLARS data base] |
| AIDSTRIALS | clinical trials of acquired immunodeficiency syndrome drugs [MEDLARS data base] |
| MEDLINE | MEDLARS On-Line |
| MEDTUTOR | microcomputer-based tutorial [for MEDLARS] |