South African Core drilling Association News. Craighall, Tvl., Rep. of South Africa: The South African Core Drilling Association, April 1974

South African Core drilling Association News. Craighall, Tvl., Rep. of South Africa: The South African Core Drilling Association, April 1974, Volume: Gilbert D953. Robert L. Gilbert First Issues collection, Gilbert. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/527519 Accessed December 27, 2025.