000 002650000a22001210004500
245 _aThe arithmatic of building
100 _aDobson, C.G.
260 _aLondon
_bTechnical Press
_c1953
300 _a82 p.
080 _a690
_bD6
041 _aEN
942 _cBK
999 _c53566
_d53566