Check out the IASLC lymph node map here:
Check out the Radiographics article I mentioned here:
Textbooks I like for chest radiology—
Med students and all residents: Felson’s Principles of Chest Roentgenology
Radiology residents: Thoracic Imaging: Pulmonary and Cardiovascular Radiology
Thoracic radiology fellows: Muller’s Imaging of the Chest: Expert Radiology Series