READING LC CALL NUMBERS
Library of Congress call numbers are arranged alphabetically and numerically.

First, follow the letters in the first part of the call number in alphabetic order from A to Z.

H145
.B37
1981
HA1551
.C5
1990
HB21
.A33
1992
HC13
.S44
2001

Second, follow the numbers in the first part of the call number as regular numbers in numerical order.

D53
.D476
1991

D785
.L24
M67
1992
D2134
.M56
S24
1995
D3247
.R32
1985

Third, follow letters in the second part of the call number in alphabetic order again from A to Z.

QA67
.B72
1991
QA67
.D438
1989
QA67
.S35
1996
QA67
.U14
1990

Fourth, follow the numbers in the second part of the call number in decimal order.

LB445
.M3

LB4445
.M352
1991
LB445
.M38
2001
LB445
.M4
2011

There can be a third set of letters and numbers which will also be in alphabetical and decimal number order.

The last part of a call number is the publication year.


Books are arranged bay by bay and call numbers are read from left to right, top to bottom.

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