000			00386pam a2200133a 44500
082			_aBTL _bB-160
100			_aCharlesworth,H P
245	1		_aGENERAL ENGINEERING PROBLEMS OF THE BELL SYSTEM
260			_a _b _c1925
300			_a27
500			_aBound With Btl B-140-159, 163-200, Lack No. 142-56,61-62,64,66,67,170-181,83-84,86,90,93-94,98
964			_gCIRC
997			_aTR17387 C
999			_c403951 _d403951