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| Utgitt
| Washington : Library of Congress; [for sale by the Supt. of Docs., U.S. Govt. Print. Off.] , 1973
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| Omfang
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| Opplysninger
| Includes bibliographical references.. - The lecture by W. Stafford was delivered at the Library of Congress on May 3, 1971; the one by Jacobsen on May 1, 1972.
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| Emner
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| ISBN
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