000 00244nam a2200097Ia 4500
008 160710s1957 xx 000 0 und d
245 _aSCIENCTIFIC AMERICAN
260 _aCHICAGO
_bLINDSAY CHEMICAL COMPANY
_c1957
300 _a192
942 _2ddc
_cB
999 _c23370
_d23370