TY - RPRT TI - NIST recommended practice guide : installing, maintaining, and verifying your charpy impact machine/ AU - Siewart, T A AU - Vigliotti, D P PY - 2000 PB - National Institute of Standards and Technology CY - Gaithersburg, MD SN - NBS SP 960-4 DO - 10.6028/NBS.SP.960-4 ER -