De ontwikkeling van het proefveldwezen in de provincie Drenthe gedurende de periode 1890 t/m 1936

De mais, teelt, veredeling en gebruik in Noord-Amerika

Addens, N. H. H., (19XX)

Social Capital 4: an Empirical Exploration of Relationships among Individual-Level Social and Human Capital Attributes and Self-Rated Health Status in Saskatchewan, Canada.

Veenstra, G., (1999)

Social Capital 2: Results from Empirical Exploration into the Relationship between Social Capital and the Performance of District Health Boards in Saskatchewan, Canada.

Veenstra, G., (1999)