- International Clay Conference (7)
- International Association for Clay Research. Gruppo italiano (2)
- International Committee for the Study of Clays (2)
- International Union of Geological Sciences (2)
- Bailey, Sturges W., 1919-1994 (1)
- Clay Minerals Society. Annual Meeting (1)
- Farmer, V. C. (Victor Colin) (1)
- Graff-Petersen, Poul (1)
- Heller, L. (Liselotte) (1)
- International Association for Clay Research (1)
- Mineralogical Society (Great Britain). Clay Minerals Group (1)
- Mortland, Max Merle, 1923- (1)
- Rosenqvist, Ivan Thoralf, 1916- (1)
- Sanchez, A. (1)
- Serratosa, J. M. (1)
- Sociedad Española de Arcillas (1)
- Spain. Ministerio de Educación y Ciencia (1)
- Universidad Nacional Autónoma de México. Instituto de Geología (1)
- Van Olphen, H., 1912- (1)
- Veniale, F. (Fernando) (1)
- Weiss, Armin (1)