Abstract
This article contains a brief account of why the BLLD has been using experimentally a machine‐readable order file, a description of the book selection and order systems employing it, and a comparison of costs with (a) the same selection procedures but using a manual file, and (b) a hypothetical bookseller‐operated approval system. The conclusions are that the system employing the ISBN file is cheaper than both and uses less staff than (a).

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