Overlap of Acquisitions in the University of London Libraries: a study and a methodology

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Abstract
The orders from forty-nine of fifty-nine University of London libraries were collected for a period of six months. A stratified sample of the orders was recorded on card and filed by country of publication. Coded details on each card gave the title and author of each order, the library making the order, the week of ordering, the publication date and the country of the publisher. Altogether 40000 orders were collected and 5000 were recorded and filed. Orders for the same publication were stapled together and placed in the duplicate file. About half the orders received were for BNB material; a third of the orders were for current BNB material. The results revealed comparatively little duplication even over a period of six months. An examination of the change of duplication with time showed that most publications were ordered on a random basis even over the six-month period. From the data received it was possible to give maximum estimates for the overlap in a twelve-month period and the eventual catalogue overlap of 1970 material.

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