Barter, pp. 96-109.

Griffith, pp. 28-45.

(2) Boring Tools.

Barnard, pp. 125-135.

Goss, pp. 53-59.

Griffith, pp. 47-52.

Seldon, pp. 38-40, 141-144.

Wheeler, pp. 353-356.

(3) Chopping Tools.

Barnard, pp. 80-88.