Perù a country study / edited by Richard F. Nyrop

Panama, a country study / edited by Richard F. Nyrop

Panama, a country study / edited by Richard F. Nyrop

Optimale Kontrolle ökonomischer Prozesse : Anwendungen des Maximumprinzips in den Wirtschaftswissenschaften / Gustav Feichtinger, Richard F. Hartl

Brazil, a country study / Foreign Area Studies, the American University ; edited by Richard F. Nyrop