TY - RPRT TI - NIST recommended practice guide Computing uncertainty for charpy impact machine test results (2008 edition) AU - McCowan, C N AU - Wang, C-M AU - Splett, J D PY - 2008 PB - National Institute of Standards and Technology CY - Gaithersburg, MD SN - NBS SP 960-18e2 DO - 10.6028/NBS.SP.960-18e2 ER -