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Empiricism, Semantics, and Ontology
http://www.ditext.com/carnap/carnap.html
Paper by Rudolf Carnap, first published in Revue Internationale de Philosophie 4 (1950): 20-40.
Logical Foundations of Probability
http://www.lawrence.edu/fac/boardmaw/Carnap_Explica2.html
Excerpt from the 1950 paper by Carnap.
Philosophical Foundations of Physics
http://www.marxists.org/reference/subject/philosophy/works/ge/carnap.htm
Chapters 23 through 26 of this 1966 work.