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UofO Examples
NASA Classification Page
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Catalogs
Michigan Spectral Catalogue Project
3031B Michigan 2-D MK Types for the HD Stars 1 (Houk, Cowley 1975)
3051B Michigan 2-D MK Types for the HD Stars 2 (Houk 1978)
3080 Michigan 2-D MK Types for the HD Stars 3 (Houk 1982)
3133 Michigan 2-D MK Types for the HD Stars 4 (Houk, Smith-Moore 1988)
Michigan Catalogue of HD stars, Vol.4
The Perkins Catalog of Revised MK Types for the Cooler Stars,
The Revised Catalog of MK Spectra Types for the Cooler Stars
,
A List of MK Standard Stars,
MK Spectral Classifications - Twelfth General Catalog
,
Anchor Points for the MK System of Spectral Classification