000			00828nam a2200301Ia 4500
008			170203s9999 xx 000 0 und d
020			_a0 753405229
050			_a0 30
050			_bP243i 1995
100			_aParker, Steve.
245			_aTunnels are round and other questions about building /
245			_cSteve Parker.
260			_aDanbury, Connecticut :
260			_bGrolier,
260			_c2003
300			_a32 pages :
300			_bcolor illustrations ;
300			_c29 cm.
440			_aI wonder why series.
500			_aIncludes index.
650			_aBuildings.
650			_aEarthmoving machinery --
650			_aEarthmoving machinery.
650			_aStructural engineering --
650			_aStructural engineering.
650			_xJuvenile literature.
650			_xJuvenile literature.
999			_c305675 _d305675