1.6. (Series Area) One or Several Series Headings (FN 1 )
1. Language editions:
a. Numbered series. Distinguish between series that are issued in two or more parallel editions, i.e., complete editions in each language for which separate records and the use of uniform titles (cf. AACR2 25.3C3) are appropriate and those that are issued variously in two or more languages but for which no separate editions of the series exist in any language. If no separate editions exist, establish a single heading, basing it on the first item in the series; if the first item is not available, base the heading provisionally on the earliest item available. If the first/earliest item itself is issued in several languages, choose the language of the title proper of the series according to the provisions of AACR2 1.0H. In case of doubt, assume that a single edition exists.
b. Unnumbered series. LC/NACO practice: If the language of the title of the series varies, establish separate headings for each language form and connect the headings by simple see also references. Do not assign AACR2 25.3C uniform titles.
2. Subsequent addition or omission of numbering:
a. Single series. Consider that a single series exists if
1. a numbered series has some random issues lacking numbering;
2. a series first issued as unnumbered later has numbers and the numbering system takes into account the previous unnumbered issues (e.g., the first ten issues were published without numbering; numbering starts with "volume 11").
b. Multiple series. Consider that multiple series exist if
1. an unnumbered series becomes numbered and the numbering system excludes the previous unnumbered issues;
2. a numbered series becomes unnumbered.
c. In case of doubt, consider the series to be a single series until other differing information is available.
See also: