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systems behaviour:modelling economic systems: / - 1 ed. - uk : the open university 1973. - ", 77p.; 30 cm." - technology:a second level course .
333 02607 9
338. uni
systems behaviour:modelling economic systems: / - 1 ed. - uk : the open university 1973. - ", 77p.; 30 cm." - technology:a second level course .
333 02607 9
338. uni