000 00249pam a2200097a 44500
082 _aTR
_bIC-9230
100 _aNabil A. Bibawy
245 1 _aMethod for the calibration of class 2 and class 4 standards of mass
260 _a
_b
_c
997 _aTR6441 C
999 _c405679
_d405679