Preliminary report on the ruins of Aké, Yucatan

von Roys, Lawrence
Society for American Archaeology : memoirs no. 20
Salt Lake City-UT : Society for American Archaeology, 1966.
Umfang/Format: X, 54 S. : 62 Ill.

The engineering knowledge of the Maya

von Roys, Lawrence
Contributions to american archaeology no. 6
Carnegie Institution of Washington publication No. 436
Washington-DC : Carnegie Institution, 1934.
Umfang/Format: S. 27-105 : 32 Ill. ; 1 Taf.