A Comparison of Three Online Information Retrieval Services / Harriet W. Zais.
Three firms which offer online information retrieval are compared. The firms are Lockheed Information Service, System Development Corporation and the Western Research Application Center. Comparison tables provide information such as hours accessible, coverage, file update, search elements and cost f...
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| Language: | English |
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[Place of publication not identified] :
Distributed by ERIC Clearinghouse,
1974.
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| Physical Description: | 32 pages |
| Format: | Microfilm Book |