1938 An article in four parts
1938 Article
1935 article
1921 Article
1939 Article
Cleves, 3 June 1942 Letter to Henricus Brandsma
6 April 1942 Speech
Dachau, 12 July 1942 Letter to his brother in law and sister
Den Haag, 6 May 1942 Letter to his brother in law and sister etc.
Cleves, 28 May 1942 Letter to Father Prior etc.
Amersfoort, 1 April 1942 Letter to Father Prior etc.
Amersfoort, 16 March 1942 Letter to Most Reverend Father Prior etc.
Scheveningen, 5 March 1942 Letter to Most Rev. Fr. Prov etc.
Scheveningen, 12 February 1942 Letter to Fr. Prov, Fr. Prior, etc.
Cleves, 12 June 1942 Letter to the German Sicherheitsdienst
1920 Article
1918 Article
1939 An article in five parts
1939 Article
1919 Article
1918 Article
1920 article
1920 Article
1921 An article in two parts
1918 Article
1938 An article in two parts
undated unfinished article
1926 Foreword
1914 Poem
1939 Article
1921 Article
1914 An article in two parts
1941 An article in five parts
1938 Foreword (Frisian)
1927 Speech
1921 Article
1933 Speech
undated sermon
1926 Summary of a speech
1914 Article
1940 Article
1941 An article in three parts
1939 An article in four parts
1940 An article in two parts
undated notes for a sermon
1907 Article
1927 Article
1914 poem
1940 Foreword (Frisian)
1941 An article in two parts
1940 Radio speech
1940 Article
1941 Article
1941 An article in two parts
1941 Article
1941 An article in three parts
undated notes for a sermon
1939 Preface
1936 Conferences
1904 Letter
1905 Letter
1938 Article
1931 Article
1940 Article
1923 Article
1920 Article
1937 Encyclopaedic article (French)
1935 design for lectures (English)
1936 Lecture (English)
1936 Lecture (English)
1936 Lecture (English)
1936 Lecture (English)
1936 Lecture (English)
1936 Lecture (English)