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Library of Congress call numbers are arranged alphabetically and numerically. Read call numbers from left to right and from top to bottom.

Letters in the first line of the call number are alphabetical:

H45 .E37 1984

HA155 .A5 1944

HB21 .A33 1982

HC13 .S47 1990

Numbers in the first line of the call number are in numerical order:

B53 .D476 1990

B785 .L44 M67 1991

B1201 .B44 W64 1997

B1246 .R66 1986

Letters in the second line are alphabetical:

KF240 .B265 1982

KF240 .C538 1989

KF240 .S795 1995

KF240 .T38 1989

Numbers in the second line of the call number are in decimal order. It is important to remember that there is an invisibile decimal point between the letter and the number:

L901 .C33

L901 .C34

L901 .C343 1976

L901 .C37 1996

There may be a third line of letters and numbers. These will also be in alphabetical and decimal number order.

The last line of the call number may be a year. This indicates the publication date.

 

* Courtesy of Ryerson Library                  

Michele Laing, Liaison Librarian for Architecture
January 25, 2008