Question: CF Industries Holdings, Inc. is a North American manufacturer and distributor of agricultural fertilizers, based in Deerfield, Illinois, for its first,of how many year, it was a federation of regional agricultural supply cooperatives, a co-operative federation or secondary co-operative is a co-operative in which all members are, in turn, co-operatives?

Related documents: [0]  [DOC] A co-operative federation or secondary co-operative is a co-operative in which all members are, in turn, co-operatives. [END] 
[1]  [DOC] CF Industries Holdings, Inc. is a North American manufacturer and distributor of agricultural fertilizers, based in Deerfield, Illinois, a suburb of Chicago. It was founded in 1946 as the Central Farmers Fertilizer Company. For its first 56 years, it was a federation of regional agricultural supply cooperatives. CF then demutualized, and became a publicly traded company. [END]  
Answer: 56
56