... Nearly every working astronomer now uses the NASA Astrophysics Data System Abstract Service regularly to access the modern technical literature. The ADS has begun a long term project to put the most important historical literature of astronomy on-line. ... Figure 2 shows the number of reads per paper via ADS as a function of publication year. ... Corbin, B. G. & Coletti, D. J. 1995, Digitization of Historical Astronomical Literature, Vistas in Astronomy, 39, 161 . ...