Columbia Encyclopedia: Logical Positivism: A concise description of this movement.
FOLDOC: Logical Positivism: Entry from this philosophical database, including an excerpt from The Ism Book.
Neopositivism: Linguistic Philosophy and Critical Rationalism: A section from Andras Gedo's work Crisis Consciousness in Contemporary Philosophy.
PhilosophyPages: Logical Positivism: Concise survey of this school and the related doctrine of "ethical emotivism."
PhilSci Archive: Logical Positivism/Logical Empiricism: Collection of online papers in Microsoft Word format, with abstracts in HTML.
Wikipedia: Logical Positivism: Entry from the openly-edited encyclopedia.