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tions in the audio-visual field, and who see a great many films in the course of their regular duties.
Reference is also made to evaluations or reviews of films appearing in magazines which are likely to be generally available in public and school libraries or audiovisual departments.
Grading. The grading symbols used in Part 2 represent, as nearly as can be determined, the audience level for which the producer intended his film to have optimum use. This does not rule out the fact that the film may be useful at other levels. It is also noted that many films are made with no specific audience in mind, and may be useful, to some extent, at all age levels.
Method of Cataloging and Classification. Films have been cataloged and classified in this Guide by the methods and tools which are in general usage by librarians for books and other printed materials. Subject headings for films are assigned with the aid of the "Sears List of Subject Headings" and the Library of Congress "Subject Headings." Extremely helpful has been the "Rules for Descriptive Cataloging in the Library of Congress: Motion Pictures and Filmstrips," 2nd Preliminary Edition, March 1953.
For classification of the films, the "Dewey Decimal Classification" Standard (15th) Edition has been followed.
Publication Schedule. According to present plans, supplements to this edition will be published semi-annually thru Spring 1957.
How to Obtain Films. To assist those who wish to purchase or rent 16mm films some brief suggestions regarding sources, etc. are given on page 1020.
Acknowledgements. The editor and The H. W. Wilson Company are very grateful for the many leaders in the field of audiovisual education, film producers, and others who have given freely their advice and suggestions.
Since it is upon the cooperation of the film sources that the comprehensiveness of this Guide depends, we wish to thank the producers, sponsors and distributors who have consistently and promptly informed us of their current releases, and also carefully verified all information on the proofs of the listings of their films in this edition of the Guide.
As it has been since its very beginning, this edition was prepared under the overall supervision of Dorothy E. Cook, editor of the "Standard Catalog" series of Wilson publications. Sincere appreciation is extended to Betty Moran and Lillian Clarke who have assisted in the editorial work and other aspects of the compilation of the Guide.
Frederic A. Krahn September 1953
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