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  • All fields: Umbra
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    • American cryptology during the Cold War, 1945-1989

    • United States. National Security Agency--History.; Electronic surveillance--United States.; Intelligence service--United States.; Cryptography--United States--History.; Cold War.
    • Top Secret Umbra, excised copy. Approved for release by NSA on 07-31-2007, FOIA case #40186.; Preserved in the OCLC Digital Archive. Harvested from http://www.gwu.edu/~nsarchiv/NSAEBB/NSAEBB260/nsa-1.pdf,...
    • Maryland Biological Stream Survey 2000-2004

    • Stream ecology--Maryland.; Indicators (Biology)--Maryland.; Water--Pollution--Maryland.; Acid deposition--Environmental aspects--Maryland.; Environmental monitoring--Maryland.
    • "August 2001."--V. 1.; "CBWP-MANTA-EA-01-5."--V. 1 cover.; Includes bibliographical references.; Harvested from the web on 10/18/07
    • Maryland Biological Stream Survey 2000-2004

    • Stream ecology--Maryland.; Indicators (Biology)--Maryland.; Water--Pollution--Maryland.; Acid deposition--Environmental aspects--Maryland.; Environmental monitoring--Maryland.
    • "August 2001."--V. 1.; "CBWP-MANTA-EA-01-5."--V. 1 cover.; Includes bibliographical references.; Harvested from the web on 10/18/07

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