Page 105 - Cataloging and Classification for Library Technicians, 2nd Edition

Classification 91

another no tation is added to the call num ber, re ferred to as the work
mark. The work mark is de cided by the cataloger and may involve
adding the pub lication date to the call num bers, which has be come a
com mon prac tice. For ex am ple:
650.14 650.14 650.14
.L112 .L112 .L112
1976 1985 1992
The work mark may involve at taching the first letter, and some -
times the first two or even three letters, of the ti tle to the call numbers.
For ex am ple:
650.14 650.14 650.14
.L112Al .L112Am .L112C
A special in struction printed in C. A. Cut ter’s Three-Fig ure Au thor
Ta ble shows that un der some cir cumstances, more than one ini tial let-
ter is used. The in struction reads, “Use one letter for words be ginning
with con sonants (ex cept S), two for words be ginning with vow els and
with S, three for words be ginning with Sc. Letters I, O, U, and X need
usually only one fig ure. Ii, Iw, Ix, Iy, Oo, Uo, Uq, Uu, Ss, and Sx can
generally be used with out fig ures.” For ex ample, for Smith, the au thor
number is .Sm69; for Schmid, the au thor num ber is .Sch52.
Some li braries do not use the Cut ter ta bles to fig ure out the au thor
numbers. In stead, au thors’ last names are used as the au thor num ber, or
in some cases, the first three let ters of an author’s last name are used.
In MARC for mat, the Dewey call num ber is al ways en tered in the
field with a 082 tag num ber. If the num ber is lo cally as signed, it is en -
tered af ter tag 092.

LIBRARY OF CONGRESS CLASSIFICATION SYSTEM

The Li brary of Con gress Clas sification sys tem is the sec ond most
widely used sys tem in the United States, used by most ac ademic li-
braries and special li braries. Many of these li braries used the Dewey
system orig inally but changed to the Library of Con gress sys tem in
the late 1960s and early 1970s.