A. Ormsbee
- Charakterisieren von behauenem rtiyolitischem Tuffstein - Die Hieroglyphen Treppe in Copán, Honduras / Characterization of Carved Rhyolite Tuff-The IHieroglyphic Stairway of Copán, Honduras. Dans: Restoration of Buildings and Monuments, v. 11, n. 4 (août 2005). (2005):