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Papers on explanation referred to by Salmon

The original papers that introduce and then more carefully discuss the DN model:  

• Hempel, The Function of General Laws in History (reprinted in Aspects of Scientific Explanation)       
• Hempel and Oppenheim, Studies in the Logic of Explanation (1948)

• Hempel, Two Basic Types of Scientific Explanation
• Hempel, Inductive-Statistical Explanation (same pdf as above)
• Curd and Cover, Commentary in Philosophy of Science: The Central Issues (commenting on Hempel as well as a few other papers)  
• Hempel, Laws and their Role in Scientific Explanation (from his introductory textbook Philosophy of the Natural Sciences)
• Hempel, Aspects of Scientific Explanation (1965)