000			00784nam a2200301Ia 4500
008			171120s9999 xx 000 0 und d
020			_a753405229
050			_a624.1
050			_bP238 1993
100			_aParker, Steve
245			_aI wonder why tunnels are round :
245			_band other questions about building /
245			_cby Steve Parker.
260			_aLondon :
260			_bKingfisher,
260			_c1993
300			_a32 pages :
300			_bcolor illustrations ;
300			_c29cm.
440			_aI wonder why.
650			_aEarthmoving machinery --
650			_aStructural engineering --
650			_aStructural engineering.
650			_xJuvenile literature.
650			_xJuvenile literature.
700			_aSeries.
700			_aTitle.
999			_c344965 _d344965