1. Carl-Olof MORFELDT 1969: Experiences of the Gas-Proof Property of Granitic Bedrock, HC 16: 69. Lecture IVA Bergmekanikkommitté.
2. Carl-Olof MORFELDT 1969: Significance of Groundwater at Rock Constructions of Different Types.
3. Carl-Olof MORFDELT 1970: The Importance of the Bedrock and the Ground Water for the Tightness of Bedrock Chambers. HC 22: 70. Lecture at IVA Bergmekanikkommitté.
4. Carl-Olof MORFELDT 1972: Storage of Oil in Unlined Caverns in Different Types of Rock. HC 27:72. Reprint “New Horizons in Rock Mechanics 14th Symp. on Rock Mech., Pennsylvania.
5. Lars LUNDSTROM 1972: Inspection of Drillholes by Means of a TV-Camera. HC 29: 72. Reprint ISRM, Stuttgart.