“Ipsen Shows Pecatonica Plant” from Rockford Register-Republic May 23, 1958
“Ipsen Plans New Factory in Boone [County]” from Rockford Morning Star January 20, 1959
“Ipsen to Move Into New Furnace Plant This Month” from Rockford Morning Star Oct. 15, 1959
“Ipsen Industries To Expand Plant at Cherry Valley” from Rockford Register-Republic Feb. 22, 1960
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