Frank R. Schell

• Practical problems in mathematics for welders
• Industrial welding procedures
• Practical problems in mathematics for welders
• Practical problems in mathematics for welders
• Ghost towns and live ones
• Idaho merchants' tokens, 1865-1967
• Idaho merchants' tokens, 1865-1970
• Ppm for Welders
• Practical problems in mathematics, metric system
• Welding procedures, electric arc
• Welding procedures, MIG & TIG
• Welding procedures, oxyacetylene