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| Utgitt
| Chicago : Information Science and Automation Division, American Library Association , 1970
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| Omfang
| 150 s. + flere pag. : fig.llus.
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| Opplysninger
| "Report on a project partially sponsored by the U.S. Office of Education, conducted by the Information Systems Office, Library of Congress"
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| Emner
| |
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| ISBN
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