000			00343pam a2200133a 44500
082			_aRL _bPCA BULL-33
100			_aPowers,T C
245	1		_aTHE AIR REQUIREMENT OF FROST-RESISTANT CONCRETE
260			_a _bAstm, Philadelphia _c1949
300			_a28
500			_aBound With Rl Pca Bull-31-32,34-50
964			_gCIRC
997			_aTR14711 C
999			_c400271 _d400271