DGRI Jahrbuch 2021/2022Robert G. Briner, Lukas Bühlmann, Sonja Dürger, Ronald Kagus, Lea Kumkar · First published 2023Open the Tome
Subsurface exploration and soil samplingSurendra Kumar Saxena, Safdar A. Gill, Robert G. Lukas · First published 1998Open the Tome
