Chisel.

Barnard, pp. 59-73.

Selden, pp. 44-50, 145-147.

Barter, pp. 93-96.

Griffith, pp. 53-64.

Goss, pp. 20-26.

Sickels, pp. 64-67.

Wheeler, 357, 421, 442.

Knife.

Barnard, pp. 48-58.