000 00254nam a2200109 a 4500
001 4140
005 20140414132039.0
008 090218s19uu xx 00 eng d
050 _aTR 372.7
_bW57 2006
245 _aWhich is bigger? Lev. 1.
541 _eM5444
999 _c113796
_d113796