The following abbreviations may be used only in the Command Search option. See Boolean Searching for examples of searches.

WAU	Author field
WCO	Author, corporate
WME	Author, meeting name
BAR	Barcode
WCK	Call number	See also: Library of Congress Classification Outline
WRD	General keyword
WLN	Language code	Use first three letters See also: MARC Code List for Languages (Library of Congress)
WCL	Library collection code	Examples: ref, stack, juv
WOW	Library, owning, field	Examples: BB, BC, BX, CC, etc.
WSL	Library, sublibrary code
WFM	Marc format (coded)	BK - books CF - computer file MP - map MU - music MX - mixed materials SE - serial VM - visual materials
WPD	Material, category of (coded)	007 field, position 1: See also: MARC 21 Concise Bibliographic: Control Field 007 A - map C - electronic resource D - globe F - tactile material G - projected graphic H - microform K - nonprojected graphic M - motion picture Q - notated music R - remote-sensing image S - sound recording T - text V - videorecording Z - unspecified
WFS	Material, form of (coded)	006field, position 1: See also: MARC 21 Concise Bibliographic: Control Fields (001-006) (identical to WRT, except for s - serial control) a - printed lanuage material c - printed music d - manuscript music e - printed cartographic material f - manuscript cartographic material g - projected medium I - nonmusical sound recording j - musical sound recording k - 2-dimensional nonprojectable graphic m - computer file o - Kit p - mix material r - 3-dimensional artifact or naturally occur'g object t - manuscript language material
WNB	New book	Example: WNB=nbl
WNC	Note, contents
WNO	Notes, general
WPE	Performer field
WPP	Publication, place of	See also: MARC Code List for Countries (Library of Congress)
WYR	Publication, year of
WPU	Publisher
WRT	Record type (coded)	See WFS
WSE	Series	Not serials / periodicals
WSC	Subject, corporate
WSG	Subject, geographical
WSM	Subject, meeting
WSP	Subject, person
WSF	Subject, uniform title
WSU	Subjects, all
SYS	System number
WTO	Title, main (245)
WUT	Title, uniform
WTI	Title
WUR	URL

Following are examples of Command Language searches:

wsu=baseball

wti=media and violence

wau=strunk and white

wau=morrison and wti=immigration

wau=nasaw and wsu=immigration

wsu=physics and wpu=oxford and wyr=200?

wow=gc