000			00428pam a2200145a 44500
082			_aRL _bPCA BULL-49A
100			_aBackstrom,J E,Burrows,R W
245	1		_aDISCUSSION OF THE PAPER VOID SPACING AS A BASIS FOR PRODUCING AIR-ENTRAINED CONCRETE
260			_a _bAstm, Philadelphia _c1954
300			_a15
500			_aBound With Rl Pca Bull-31-48, 49-50.
700			_aWolkodoff,V E
964			_gCIRC
997			_aTR14727 C
999			_c400329 _d400329