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| UNIVERSITY OF LONDON OBSERVATORY (ULO)
| UCL Department of Physics and Astronomy
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The MKK and Revised MK Atlas

The MKK and Revised MK Atlases are fundamental references for the MK system of spectral classification of normal stars.

The online-versions of the MKK and the Revised MK Atlas were produced by Dr M. M. Dworetsky and W. R. Reece at the University of London Observatory, University College London, with permission from the copyright holders, The University of Chicago Press and from Dr H A Abt (co-author of the Revised Atlas).