TY - RPRT TI - Report No. 18 : ultrasonic railroad wheel inspection using EMATS AU - Schramm, Raymond E AU - Van Clark, A PY - 1988 PB - National Bureau of Standards CY - Gaithersburg, MD SN - NIST IR 88-3906 DO - 10.6028/NIST.IR.88-3906 ER -