Sanyutta Nikaya. Connected Discourses of the Buddha. Large Book. Part 5

This is the third of the four great collections of the Sutta Pitaka of the Pali Canon. The fifth and final part of the Sanyutta Nikaya is called "The Great Book" (Mahavagga).

It contains quite substantial chapters that examine various elements of Buddhist practice, such as the factors of enlightenment, spiritual qualities, foundations of mindfulness, the Eightfold Path, meditation on breathing, and so on. 

In other words, the Mahavagga is dedicated to the analysis of the Fourth Noble Truth - the truth about the path. Standing apart are the last two Suttas - about the stream-enterer, the very initial level of noble disciples, and about the four truths themselves as such.