Stock Photo - ***JULY 24, 1972 FILE PHOTO***Chemical plant production of ammonia and fertilizers in Vratsa, Bulgaria, July 24, 1972. It processes natural gas, which is transported to the plant from the Chiren field in northwest Bulgaria through Kozloduy to Oryahovo, Bulgaria. (CTK Photo/Emil Bican)

Stock Photo: ***JULY 24, 1972 FILE PHOTO***Chemical plant production of ammonia and fertilizers in Vratsa, Bulgaria, July 24, 1972. It processes natural gas.

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