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National Emphysema Foundation
This site has detailed information on emphysema and other Chronic Obstructive Pulmonary Diseases (COPD), such as chronic bronchitis.
Other
The Lung Association: Emphysema
An explanation of Emphysema, using text and illustrations to help with understanding.
Inner Body
Innerbody: Respiratory System: Terminal Bronchi and Alveoli
Detailed description and illustration of the terminal bronchi and alveoli.