000			00400pam a2200145a 44500
082			_aRL _bPCA BULL-46
100			_aPowers,T C
245	1		_aTHEORY OF VOLUME CHANGES IN HARDENED PORTLAND CEMENT PASTE DURING FREEZING
260			_a _bAstm, Philadelphia _c1953
300			_a12
500			_aBound With Rl Pca Bull-31-45, 47-50.
700			_aHelmuth,R A
964			_gCIRC
997			_aTR14724 C
999			_c400326 _d400326