I. INTRODUCTION
II. LAGRANGIAN FROM HEAVY QUARK SPIN SYMMETRY
A. Heavy mesons  
B. Heavy baryons  
III. POTENTIALS
A. Conventions  
B. Potentials from light vector exchange  
C. Potentials from vector charmonia exchange  
IV. MOLECULAR STATES FROM CONSTANT INTERACTIONS
A. Poles  
B. Discussions of selected systems  
V. SUMMARY AND DISCUSSION