[170] For a striking visual presentation of some of the findings of the Einstein Observatory, see the "Visions of 'Einstein,' " a slide set of the X-ray images from the HEAO 2 satellite, produced by the Office of Printing and Photographic Services of the Smithsonian Institution in cooperation with the High Energy Astrophysics Division, Harvard-Smithsonian Center for Astrophysics, with an accompanying text by James Cornell and F. R. Harnden, Jr.