| Cluster Catalogs |
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| | Palomar
Sky Survey using 48 inch |
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| Schmidt
telescope (1950s) |
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| | Abell
(1958) cataloged rich clusters a |
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| famous
work and worth a look |
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| | Abell,
Corwin, & Olowin (1989) did the |
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| same
for the south using similar plates |
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| | All
original work was by visual inspection |
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