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  1. By: Tölken, H R
    Type: Article
    In: Journal of South African Botany
    Volume: 38
    Issue: 2
    Date: 1972
    Page Range: 67--80
    Publication Info: Kirstenbosch National Botanic Gardens of South Africa
  2. By: Tölken, H R
    Type: Article
    In: Journal of South African Botany
    Volume: 39
    Issue: 3
    Date: 1973
    Page Range: 233--234
    Publication Info: Kirstenbosch National Botanic Gardens of South Africa
  3. By: Tölken, H R - Wiens, Delbert
    Type: Article
    In: Journal of South African Botany
    Volume: 45
    Issue: 2
    Date: 1979
    Page Range: 223--225
    Publication Info: Kirstenbosch National Botanic Gardens of South Africa
  4. By: Tölken, H R
    Type: Article
    In: Bothalia
    Volume: 12
    Issue: 2
    Date: 1977-11-11
    Page Range: 191--194
    Publication Info: Pretoria Botanical Research Institute, Dept. of Agricultural Technical Services 1921-
  5. By: Tölken, H R
    Type: Article
    In: Journal of South African Botany
    Volume: 41
    Issue: 2
    Date: 1975
    Page Range: 93--124
    Publication Info: Kirstenbosch National Botanic Gardens of South Africa
  6. By: Tölken, H R
    Type: Article
    In: Journal of South African Botany
    Volume: 44
    Issue: 1
    Date: 1978
    Page Range: 89--91
    Publication Info: Kirstenbosch National Botanic Gardens of South Africa