G 60, sec. 3.b. (excerpted from Subject Cataloging Manual: Shelflisting)
b. Cuttering for numerals. When Cuttering for Roman or Arabic numerals, use the Cutters .A12 - .A19. However, if entries already in the shelflist have been assigned "documents numbers" (e.g. .A5 for the corporate heading United States ...) Cutter numerals to file directly behind those entries. Because of the infinite range of numbers, choose a Cutter toward the center of the available span when Cuttering for the first numeral in a class. This will allow room for both smaller and larger numbers. Follow this practice even with relatively low numbers since decimal fractions are filed in numeric order before the number 1.
Examples:
QC457
.A15 1981 commercial composite infrared index, grating molecular
1982 index ... 1982.
QC457
.A154 1981 commercial composite infrared index, grating numerical
1982 index ... 1982.
QC457
.A156 1981 commercial composite infrared index, grating spec-finding
1982 index ... 1982.
Documents numbers:
UF523
.A5 U.S. Ordinance Dept.
1918a Handbook of ordinance data ... 1918.
UF523
.A53 1880's American arms ... 1981.
1981
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