Back in Time

Pubmed has expanded its coverage to include articles back to 1947, according to the National Library of Medicine:

Harry Truman was President, gas cost 15 cents a gallon, the transistor was invented, and internationally renowned surgeon Dr. Michael DeBakey was publishing articles on the US Army’s World War II experience with battle injuries, military surgery, and the use of streptomycin therapy. Citations to these and more than 60,000 other articles indexed in the 1947 Current List of Medical Literature (CLML) are now available in the National Library of Medicine?« (NLM?«) MEDLINE?«/PubMed database.

That brings the number of citations available in PubMed to a whopping 20 million! That is a lot of biomedical research for only 63 years.