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:The yearbook of a learned society includes mainly its conference proceedings and a directory of its members. Each volume is bound with title page and index. An index is published every five years. The components of this field are as follows.
Character position Value Notes0 a Periodical1 k Annual2 a Regular3 h Yearbook4-6 g## Contains directory information7 l Contains annual conference proceedings8 z Other (title page is part of annual volume)9 z Other (index is part of annual volume)10 1 Cumulative index available
== Історія ==