For studying polyatomic molecules from a physics perspective, key recommendations include Herzberg’s comprehensive four-volume series "Molecular Spectra and Molecular Structure," which covers a wide range of topics. For a focused exploration of vibrational structure, "Molecular Vibrations" by Wilson, Decius, and Cross is highlighted as a classic resource, noted for its affordability as a Dover publication. These texts provide essential insights into the physics of polyatomic molecules, making them suitable alternatives to Brown and Carrington.