Media type: E-Article Title: The Relation Between Cluster Density and Bautz-Morgan Type Contributor: van den Bergh, Sidney; Deroux, James imprint: American Astronomical Society, 1978 Published in: The Astrophysical Journal Language: English DOI: 10.1086/155784 ISSN: 0004-637X; 1538-4357 Keywords: Space and Planetary Science ; Astronomy and Astrophysics Origination: Footnote: Access State: Open Access