American Medical Index (IM) is the most widely used and influential medical literature retrieval tool in the world. It was edited and published by the National Library of Medicine (NLM) and founded in 1879. It has a history of 100 years, and its publishing name, publishing organization and layout style have been changed many times.

IM has collected nearly 4,000 biomedical and related journals in more than 40 languages in more than 70 countries and regions around the world, covering all fields of biomedicine, 70% of which are English documents, including journal papers, editorial comments, reviews, conference papers, biographies of celebrities, obituaries and so on.

Features: A wide range of documents are included, and the amount of information reported is large, which can reflect the development trends of biomedical disciplines in time. Strong document editing ability and high document index quality. NLM employs famous medical experts, medical editors and medical library science experts to guide the editing work of IM, collect valuable documents, compile medical thesaurus, and ensure the absolute superiority of quality.

Report documents quickly and have short time difference. 1964, NLM established MEDLARS (Medical Literature Analysis and Retrieval System), which realized the computer management of literature processing, indexing and retrieval, and greatly accelerated the speed of literature reporting. Standardized indexing and convenient retrieval. If you choose the right words, you can find the content of the document at one time, and the retrieval is fast and convenient.