The Natural History of Clay

by Alfred B. Searle

5. "Die Tone." P. Rohland. Hartleben's Verlag. Vienna. 1909.

6. "Clays: their Occurrence, Properties and Uses." H. Ries. Chapman and Hall. London. 1908.

7. "Gesammelte Schriften." H. Seger. Tonindustrie Zeitung Verlag. Berlin. 1908.

8. "Tonindustrie Zeitung." 1902. p. 1064.

9. "Tonindustrie Zeitung." 1904. p. 773.

10. "Treatise on Ceramic Industries." E. Bourry (Revised translation by A. B. Searle). Scott, Greenwood and Son. London. 1911.

11. "The Colloid Matter of Clay." H. E. Ashley. U.S.A. Geological Survey Bulletin 388. Washington. 1909.

12. "Sprechsaal." 1905. p. 123.

13. "Action of Heat on Refractory Materials." J. W. Mellor and F. J. Austen. Trans. Eng. Cer. Soc. VI. Hughes and Harber. Longton, Staffs. 1906.

14. "Wiedermann's Annalen." VII. p. 337.