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Published online by Cambridge University Press: 05 March 2015
The history of our understanding of the interstellar medium has a pre-modern era and an early-modern era. Several threads show continuity in observational approach and interpretation, reaching from the first decade of the last century to the present. The first 50 years were a period of pioneering work, done mostly by stellar astronomers, who chanced upon the ISM by a strange variety of pathways.