Guidelines for standardised lithostratigraphic descriptions = Riglyne vir gestandaardiseerde litostratigrafiese beskrywings
M. R. Johnson Geological Survey (South Africa); South African Committee for Stratigraphy.
Pretoria : Govt. Printer 1987
Disponible en IGC - Instituto de Geociências (r551.7014 G946s )(Obténgalo)