000			00343nam a2200145 a 4500
005			20140412111303.0
008			001120s19uu xx 00 eng d
020			_a0-7172-4589-6
050			_aER _bOn2 1990
245			_a1, 2, 3.
300			_a1 v. (unp.) ; col. ; ill.
650			_aCounting
650			_aNumber concept
999			_c103518 _d103518