Notes in mathematics (Problems, theorems, conjectures etc.)
Softcover notebook, 1936–1950. pp. 1–165, 200–202. Some pages, which do not harm the text, are missing.
Three hardcover notebooks, 1948-
Most of the material appeared in Beurling’s papers. Some results and observation pertaining to complex and harmonic analysis were not published, and might be new even now. Some pages contain computations, in contrast to the ‘Uppsala notebook’.