scientific article published in 1967

scientific article published in 1957

article by Harald Drewes published 1972 in Geological Survey Professional Paper

scholarly article

article

scholarly article

scholarly article by Harald Drewes published in January 1963

article published in 1971

scientific article published in 1966

article by Harald Drewes published 1968 in Open-File Report

scientific article published in 1962

scientific article published in 1958

scholarly article by Harald Drewes published in January 1972