TY - RPRT TI - Review and refinement of ATC 3-06 tentative seismic provisions : report of Technical Committee 1 : seismic risk maps AU - Ellingwood, Bruce R PY - 1980 PB - National Bureau of Standards CY - Gaithersburg, MD SN - NBS IR 80-2111-1 DO - 10.6028/NBS.IR.80-2111-1 ER -