00283nam a2200109Ia 450000500170000000800410001708200150005810000200007324500260009326000460011930000080016520260224040943.0260224s9999||||xx |||||||||||||| ||und||  a671.52 POT  aMorgan H Potter 0aOxyacetylene welding.  aChicago: American Technical Societyc1956  a140