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Abstract
This paper is a description of the National Library of Medicine's PubMed Central. PubMed Central comprises back issue scanning and digitization project of scanned back issues journals from the mid 1800s and current content from publishers. The National Library of Medicine's PubMed Central Archive is growing by thousands of articles per month. The back issues now account for two-thirds of the total archive of about 720,000 articles from 210 journals.