References
- Industrial and Engineeriong Chemistry v.59 no.9 Attapulgite-Its properties and applications Haden W.L.;Jr.;Schwint I.A.
- AIME preprint no. v.9 The characteristics and use of clays for gelling water fluids Sawyer E.W.;Jr.
- AIME preprint no. v.7 Bentonites and special clays Mayhew E.J.;Mayhew J.D.;Collins M.
- Developments in Sedimentology Clays of the palygorskite-sepiolite group: environment, age, and distribution ;in:Palygorskite-Sepolite:Occurrebces, Genesis and Uses Callen R.A.
- PhD Dissertation A Sedimentological Mineralogical and Geochemical Study of the Fuller's Earth Deposits of the Miocene Hawthorne Group of South Georgia-North Florida Merkl R.S.
- in: Industrial Minerals & Rocks 6th (ed.) Clays: Hormites - palygorskite(attapulgite) and sepiolite Heivilin F.G.;Murray H.H.
- Developments in Sedimentology v.37 Origin and geologic implications of the palygorskite deposits of S.E. United States Weaver C.E.
- Geology of Clays Millot G.
- Deveolpments in Sedimentology v.37 Sepiolite-paygorskite in Spanisn Tertiary basins: genetical patterns in continental environments Galan E.;Castillo A.
- Clays and Clay Minerals v.30 no.3 Palygorskite-sepiolite clays of Lebrija Galan E.;Ferrero A.