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In OCLC Connexion, to search for an authority you can either use SHIFT-F2 or by clicking on 
.
Where you search for an authority record, you will the image like this below: 
Here are the equilvalent MARC codes and the equilavalent Authority Names:
MARC | Authority Names |
|---|---|
240, 440, 490 | Titles |
110, 651, 710 | Corporate Names |
100, 700 | Personal Names |
650 | Subjects |