From the library – Public Speaking – Voice Power – care and feeding of the professional voice

A comprehensive article on voice, this one ...

Whether it's the rich, resonant tones of Richard Burton, the breathiness of Marilyn Monroe or the nasality of Fran Drescher, the sound of the voice conjures up an image—an impression—and can influence perception.

Speakers know how to use the voice for effect but don't always use the voice effectively. This can cause a variety of illnesses which can prevent speakers from doing what they do best—speak.

and it goes on to give basic, practical ways to care for and cure the voice. I have saved it here in the library