Chest Development by Boyer Coe is an excellent ebook covering all aspects of training the chest, which includes developing the rib cage, training the pectoralis minor and major, as well as the serratus and intercostal muscles. 
In this ebooklet, Boyer describes the anatomy and function of each muscle of the chest area, and describes the importance of developing the ribcage, as well as the associated muscles (serratus and intercostals) and larger pectoralis muscles.
Exercises covering the complete development of the chest (rib cage, serratus intercostals, pectoralis) are all described and illustrated. Special exercises such as the Gironda Dip, and isolation exercises are also described for developing certain lagging areas of the chest.
Boyer also describes his favourite programs, as well as programs for beginners, intermediates and advanced athletes. 16 pages