TY - RPRT TI - Mechanical and thermal properties of ceramics : proceedings of a symposium held at Gaithersburg, Maryland, April 1-2, 1968 AU - Wachtman, J B PY - 1969 PB - National Bureau of Standards CY - Gaithersburg, MD SN - NBS SP 303 DO - 10.6028/NBS.SP.303 ER -