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Argon - Wikipedia
Strong Lines of Argon ( Ar ) - NIST
Argon - NIST Chemistry WebBook
Argon - NIST Chemistry WebBook
Argon - Element information, properties and uses | Periodic Table
Atomic Spectra - HyperPhysics
Atomic Spectra - HyperPhysics
Element Argon - AtomTrace
Argon - NIST Chemistry WebBook
The Emission Spectra of Various Atoms - Ohio State University