000 00275pam a2200097a 44500
082 _aTR
_bRI-9359
100 _aPhilip W. Holland
245 1 _aMass spectrometer method for determining helium in the part-per million to 10-percent range
260 _a
_b
_c
997 _aTR6741 C
999 _c405898
_d405898