Engineering contractsde J. A. L. WaddellMateriasSpecificationsEngineeringEdiciones (3)Engineering contracts (1905)inglésEngineering contracts. (1905)inglésEngineering contracts (1905)inglésMás obras de J. A. L. WaddellBBridge engineeringBridge engineering1916EEconomics of bridgeworkEconomics of bridgework1921Addresses to engineering students