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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Heckard, Lawrence R - Shevock, James R.
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 32
    Date: 1985
    Page Range: 179--185
    Publication Info: Berkeley, California Botanical Society,
  2. By: Heckard, Lawrence R - Bacigalupi, Rimo
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 33
    Date: 1986
    Page Range: 271--277
    Publication Info: Berkeley, California Botanical Society,
  3. By: Heckard, Lawrence R
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 20
    Date: 1969
    Page Range: 231--235
    Publication Info: Berkeley, California Botanical Society,
  4. By: Heckard, Lawrence R - Bacigalupi, Rimo
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 20
    Date: 1969
    Page Range: 209--213
    Publication Info: Berkeley, California Botanical Society,
  5. By: Heckard, Lawrence R - Howell, John Thomas, - Bacigalupi, Rimo
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 19
    Date: 1967
    Page Range: 97--108
    Publication Info: Berkeley, California Botanical Society,
  6. By: Heckard, Lawrence R
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 38
    Date: 1991
    Page Range: 141--142
    Publication Info: Berkeley, California Botanical Society,
  7. By: Heckard, Lawrence R
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 22
    Date: 1973
    Page Range: 41--70
    Publication Info: Berkeley, California Botanical Society,