00286nam a2200109Ia 450000500170000000800410001708200170005810000180007524500370009325000120013026000340014220250107154853.0241216s9999||||xx |||||||||||||| ||und||  a620.136 MUR.  aMurdock L. J. 0aConcrete Materials and Practice.  a5th ed.  aLondon.bEdward Arnold.c1979