000
00273nam a2200085Ia 4500
008
211105s9999 xx 000 0 und d
020
_a
"
100
_a
Piet Human ... [et al]
_9
118427
245
0
_a
Mathematics at work, standard 4 : teacher's guide, a problem-centered approach
999
_c
580107
_d
580106