1 Pictures are worth many words : 1 Pictures of the cities : 1 Pictures of the relations of a graduate program in Management through the sociometric analysis 1 Pictures on Opposing Pages 1 PID Control. Servo/regulation performance and robustness issues 1 PID robusto : 1 Pie Plates 1 Piece of Ass 1 Pieces 1 Piecewise bounded quadratic systems in the plane