Descripción
| Publicado: | Began with vol. 1, no. 1 (Feb. 1954); ceased with v. 41, no. 9 (May 1994) |
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| Notas: | Published in Reston, Va., Oct. 1973-May 1994. |
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| Descripción Física: | 41 volumes : illustrations ; 25-28 cm |
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| Frecuencia de Publicación: | Monthly (Sept.-May.), Sept. 1979-May 1994 |
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| Formato: | Master and use copy. Digital master created according to Benchmark for Faithful Digital Reproductions of Monographs and Serials, Version 1. Digital Library Federation, December 2002.
Mode of access: World Wide Web. |
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| ISSN: | 23270756 |
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