1. Theoretical Considerations.- General Approach.- Groups.- The Political Activities of Interest Groups.- Factors Affecting the Nature of the Political Activities of Interest Groups.- The Case of the Political Activities of Dutch Agricultural Organisations on International Issues.- 2. International Agricultural Problems.- 3. Background of Dutch Political Life.- 4. Agricultural Organisations in the Netherlands.- 5. Earlier Benelux Problems.- 6. Proposals for a European Organisation of Agricultural Markets.- 7. Negotiation and Ratification of the Treaty Establishing the European Economic Community.- 8. Implementation of the Treaty Establishing the European Economic Community I: Institutions and Issues.- Institutional Arrangements.- Policy Issues.- 9. Implementation of the Treaty Establishing the European Economic Community II: The Political Activities of Dutch Organised Agriculture.- Political Activities Within The Netherlands.- Political Activities Outside The Netherlands.- 10. Later Benelux Problems.- 11. Further Attempts to Co-ordinate Western European Agricultural Policies.- 12. Non-Regional Issues.- 13. Conclusions.- Selected Bibliography.