Abstract
The complexity explosion has led to ever-increasing difficulties in subject specification, especially in the use of notation in classified arrangement. Two recent developments, the use of DC18 and PRECIS in the British National Bibliography, form a substantial contribution towards the solution of these difficulties, particularly in view of the increased presstere for standardization arising from the use of computers.
Edited version of a paper read at the AAL Course "Cataloguing and Indexing: Recent Developments", held at Folkestone, March 6-9, I972.
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