Integrating geoarchaeological techniques to reveal the invisible stratigraphy at Umhlatuzana rockshelter, South Africa - a grid-based approach - Reidsma, Femke H.; Sifogeorgaki, Irini; Dinckal, Ada; Huisman, Hans; Sier, Mark Jan; Os, Bertil van; Dusseldorp, Gerrit (2021)