Urea prtees bump up; CHSfirst-quarter earnings off; Helena files suit against Mesq uite residents; Gavilon adds to its grain business; CF seeks to acquire Terra for 2.1 billion dollar; Terra to evaluate unsolicited proposal: CF Industries Holdings Inc. said late Jan. 15 that it has proposed to acquire all of the outstanding common shares of Terra Industries Inc. in a transaction that would create a leader in the global fertilizer industry.
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