References:*

(4) Scraping Tools.

Barnard, pp. 136-142.

Wheeler, pp. 465, 473.

Griffith, pp. 71-75.

Selden, pp. 149, 177, 182.

Hodgson, I, pp. 61-74.

(5) Pounding Tools.

Barnard, pp. 24-47.

Sickels, p. 70.