This fonds contains materials relating to Gruen's academic research in applied mycology and botany, and documents his personal interest in Japan, in philately, and on the uses of fungi as tinder for early methods of fire making. It contains personal correspondence, including diaries; as well as material documenting his early life and education.

This collection contains research notes, diaries, and printed material dealing with entomology (in particular, the study of midges), bonsai, and the classification of birds. The photographic material includes subjects relating to Saunder's research; views from his extensive travels (including Egypt [1932]; Ceylon [1932]; Brazil [1923]; Hong Kong and the Far East [1932]; and North America, particularly Emma Lake [1939-1943].

This fonds contains material relating to the personal and professional life of Luise Herzberg, including materials relating to her childhood and schooling; family documents; materials relating to her parents, Paul and Elsbeth Oettinger, correspondence with her sister, Lotte Thurnauer; and materials received or collected by her son Paul Herzberg. The fonds contains substantial material relating to Luise’s scientific work, including correspondence with international colleagues, and reprints of her articles.