010    Library of Congress Control Number (LCCN)

040    Holding code of institution that created and/or edited the authority record

100    Authorized heading—Personal name

110    Authorized heading—Corporate name

111    Authorized heading—Conference name

130    Authorized heading—Uniform title

150    Authorized heading—Topical subject term

151    Authorized heading—Geographic name

155    Authorized heading—Genre subject term

4xx    Cross reference (“see from”) ( 400, 410, 411, 430, 450, 451—depending on the type of heading in the field)

5xx    “See also” reference ( 500, 510, 511, 530, 550, 551--depending on the type of heading in the field)

670    “Source data found” note (citation of a work in which the heading in the 1xx field appears; often this is the item being cataloged)