Search Results       Your search for [author]De Haan, D. Bierens. returned 1 record.           Guiding principles of activity, based on the application of scientific method : what sociologists should know for the radical improvement of the life of man. by De Haan, D. Bierens.; Leiden: Brill, 1958. Subject: Life; Conduct of Life.          Add to Book Cart Relevance: 26.78%