This classification was published as a second edition in 1955 by H. K. Lewis & Co. Ltd. The first edition (1936) was based on the library of the London School of Hygiene and Tropical Medicine; but, in preparation of the new edition, the author was aware that many other medical libraries were using the scheme and changes were introduced to accommodate the needs of other, more general, medical libraries (see below). A third edition is in preparation by the author of this paper; but this new edition will largely consist of additions and amendments and will not involve the extensive re‐location of subjects which was necessary for the second edition.
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