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    1. American fertilizer practices

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    Collection:
    Agricultural Communications Documentation Center (ACDC)
    Contributers:
    National Fertilizer Association (author)
    Format:
    Research summary
    Publication Date:
    1929
    Published:
    USA: Extension Service, U.S. Department of Agriculture, Washington, D.C.
    Location:
    Agricultural Communications Documentation Center, Funk Library, University of Illinois Document Number: D08957
    Notes:
    Page 16 in Lucinda Crile, Findings from studies of bulletins, news stories, and circular letters. Extension Service Circular 488. Revision of Extension Service Circular 461, which it supersedes. May 1953. 24 pages. Summary of research reported by the National Fertilizer Association, Inc., Washington, D.C. 1929. 38 pages.

    2. Extension methods and their relative effectiveness

    <span class="translation_missing" title="translation missing: en.bibleaves.discover_item">Discover Item</span>
    Collection:
    Agricultural Communications Documentation Center (ACDC)
    Contributers:
    Wilson, Meredith C. (author)
    Format:
    Research summary
    Publication Date:
    1929
    Published:
    USA: Extension Service, U.S. Department of Agriculture, Washington, D.C.
    Location:
    Agricultural Communications Documentation Center, Funk Library, University of Illinois Document Number: D08964
    Notes:
    Page 24 in Lucinda Crile, Findings from studies of bulletins, news stories, and circular letters. Extension Service Circular 488. Revision of Extension Service Circular 461, which it supersedes. May 1953. 24 pages. Summary of Agriculture Technical Bulletin 106, contribution from Extension Service, U.S. Department of Agriculture, Washington. 1929. 48 pages.