Mathur P N Layers of techniques Implications of the co-existence of different technologies for general economies and industrial firms. - New Delhi Manak Publications 2010 - xxiii;226p. cm. ISBN: 1600 Standard No.: 119737 Source: 156, 01/10/2013, Classic Book Service Textual Subjects--Topical Terms: Business Economics Dewey Class. No.: X.2'P, P9;1