000 00187 a2200073 4500
020 _a9781433934650
082 _223
_aJ 629. 133352 EASO
245 _aHow does it work, How does a helicopter work
999 _c792381
_d792380
942 _w8485
_xJulia Mabuza
_y8485
_zJulia Mabuza