Roys , Lawrence The engineering knowledge of the Mata , by Lawrence Roys. With one plate and thirty two text- figures ( Issued March 1934) In Carnegie institution of Washington.Contributions to American archaelogy ( Washington) 1934. 29 x 23 cm v. 2, no. 6 , p. (27) - 105 incl. illus. , map., plans, disgr.) Bibliography : p. 101