Raman spectra of three readily available C-type stoichiometric rare-earth sesquioxide powders of composition Ln<sub>2</sub>O<sub>3</sub> are presented. Some correlations of spectra with body-cell structure and infrared absorption spectra have been made. Spectra of Eu<sub>2</sub>O<sub>3</sub>, Dy<sub>2</sub>O<sub>3</sub>, and Tm<sub>2</sub>O<sub>3</sub> display several new peaks that have not as yet been reported. Assignments of certain peaks to electronic Raman and resonance Raman transitions are discussed.

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