Gerhard Pratt:
Field excursion near Sudwala, South Africa
Gerhard Pratt:
Malmani giant stromatalites, near Sudwala South Africa
Gerhard Pratt:
Field excursion near Sudwala, South Africa
Gerhard Pratt:
Sudwala Caves, South Africa
Gerhard Pratt:
Sudwala Caves, South Africa
Gerhard Pratt:
Sudwala Caves, South Africa
Gerhard Pratt:
Sudwala Caves, South Africa
Gerhard Pratt:
Sudwala Caves, South Africa
Gerhard Pratt:
Field Geology near Barbeton, South Africa
Gerhard Pratt:
Tour of the Sheba Gold Mine, near Barbeton, South Africa
Gerhard Pratt:
Tour of the Sheba Gold Mine, near Barbeton, South Africa
Gerhard Pratt:
Tour of the Sheba Gold Mine, near Barbeton, South Africa
Gerhard Pratt:
Tour of the Sheba Gold Mine, near Barbeton, South Africa)
Gerhard Pratt:
Komatiites (Kromdraai Camp, Komati River, near Barbeton, South Africa)
Gerhard Pratt:
Komatiites (Kromdraai Camp, Komati River, near Barbeton, South Africa)
Gerhard Pratt:
Komatiites (Kromdraai Camp, Komati River, near Barbeton, South Africa)
Gerhard Pratt:
Komatiites (Kromdraai Camp, Komati River, near Barbeton, South Africa)
Gerhard Pratt:
Komatiites (Kromdraai Camp, Komati River, near Barbeton, South Africa)
Gerhard Pratt:
Komatiites (Kromdraai Camp, Komati River, near Barbeton, South Africa)
Gerhard Pratt:
Roadside Service Station with Wildlife Enclosure, near Inyanda South Africa
Gerhard Pratt:
Roadside Service Station with Wildlife Enclosure, near Inyanda South Africa
Gerhard Pratt:
Roadside Service Station with Wildlife Enclosure, near Inyanda South Africa
Gerhard Pratt:
Inyanda Coal Mine
Gerhard Pratt:
Inyanda Coal Mine
Gerhard Pratt:
Tour of the historical Blaauwbank gold mine.
Gerhard Pratt:
Tour of the historical Blaauwbank gold mine.
Gerhard Pratt:
Tour of the historical Blaauwbank gold mine.
Gerhard Pratt:
Tour of the historical Blaauwbank gold mine.
Gerhard Pratt:
Tour of the Cullinan diamond mine, near Pretoria, South Africa
Gerhard Pratt:
Tour of the Cullinan diamond mine, near Pretoria, South Africa
