00296nam a2200109Ia 450000500170000000800410001708200150005810000200007324500410009326000460013430000060018020260224041016.0260224s9999||||xx |||||||||||||| ||und||  a671.52 POT  aMorgan H Potter 0aStudy guide of oxyacetylene welding.  aChicago: American Technical Societyc1956  a9