Dangos 1 - 2 canlyniadau o 2 ar gyfer chwilio 'Sweetman, Harvey L.', amser ymholiad: 0.00e Mireinio'r Canlyniadau
  1. 1
    The principales of biological control : interrelation of hosts and pests and utilization in regulation of animal and plant populations

    The principales of biological control : interrelation of hosts and pests and utilization in regulation of animal and plant populations gan Sweetman,Harvey L.

    Cyhoeddwyd 1958
    Llyfr
    Ychwanegu at ffefrynnau
    Wedi'i Gadw mewn:
  2. 2
    The biological control of insects: with a chapter on weed control

    The biological control of insects: with a chapter on weed control gan Sweetman, Harvey L.

    Cyhoeddwyd 1936
    Llyfr
    Ychwanegu at ffefrynnau
    Wedi'i Gadw mewn:

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