000 00275pam a2200109a 44500
082 _a530.7
_bN21
100 _a
245 1 _aNATIONAL PHYSICAL LABORATORY
_bREPORT FOR THE YEAR 1961
260 _a
_bHer Majesty'S Stationery Office
_c1962
964 _gCIRC
997 _a52104 C
999 _c412861
_d412861