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Siegfried, W. R.

Conservation of ecosystems : theory and practice - a report on a workshop meeting held at Tsitsikama, South Africa, September 1980

1982 Siegfried, W. R. | Davies, B. R. |

South African red data book : aves

1976 Siegfried, W. R. |

South African environments into the 21st century

1989 Huntley, Brian | Siegfried, W. R. | Sunter, Clem |

Waterfowl of the Cape Province : a guide for hunters and naturalists

1963 Siegfried, W. R. |

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