Debut album by Joy Division. 12-inch vinyl in a textured picture sleeve printed by Garrod & Lofthouse with a white printed inner sleeve. The album cover design by Peter Saville draws on an image showing successive pulses from the first pulsar discovered, CP1919. Guitarist Bernard Sumner had seen the image in a copy of the encyclopaedia in Manchester Library and thought it would make a good sleeve design. Harold D. Craft Jr created and published the image in his 1970 PhD thesis "Radio Observations of the Pulse Profiles and Dispersion Measures of Twelve Pulsars". The image was also printed in the Scientific American in January 1971 before it appeared in the Cambridge Encyclopaedia of Astronomy in 1977.