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  1. By: Cowling, R M - Campbell, B. M.
    Type: Article
    In: Journal of South African Botany
    Volume: 49
    Issue: 2
    Date: 1983
    Page Range: 87--101
    Publication Info: Kirstenbosch National Botanic Gardens of South Africa
  2. By: Cowling, R M - Mitchell, D T
    Type: Article
    In: Journal of South African Botany
    Volume: 47
    Issue: 4
    Date: 1981
    Page Range: 743--750
    Publication Info: Kirstenbosch National Botanic Gardens of South Africa