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Some economic factors affecting safety in underground bitum..:

, In: Southern economic journal / publ. by the Southern Economic Association, College of Business Administration, of Tennessee University. With financial support from Virginia Commonwealth University, School of Business, Department of Economics
Andrews, W. H. ; Christenson, C. L.. (1974)  3 - p. 364-376
Exemplar:  Zentrale:Magazin Zs fc 6857; Zentrale:Magazin Zs fc 6857