Joshi, Prabha2016-07-202016-07-202016-07-19http://www.aiktcdspace.org:8080/jspui/handle/123456789/1720Preliminary Geological Investigation and their importance to achieve safety and economy of the projects supporting dams and tunnel projects ,methods of surface and subsurface investigations, excavations-Trial pit, trenches etc.en-USeCourseware - CETeaching Aids