Study No. 10 (Short 1932)
Study No. 11 (Short 1932)
Study No. 14 (Short 1933)
Study No. 1 (Short 1929)
Studie Nr. 2 (Short 1930)
Studie Nr. 3 (Short 1930)
Study No. 4 (Short 1930)
Studie Nr. 5 (Short 1930)