THREE BLACK SOFTCOVER NOTEBOOKS
Most likely, these are preparatory notes for the courses Beurling taught in Uppsala in 1944-1945. In Swedish.
HARMONIC ANALYSIS. LECTURE NOTES FROM BEURLING'S LECTURES AT HARVARD (1948–49)
One page written in Beurling's handwriting attached.
LECTURES ON THE WIENER-HOPF EQUATION
Item 63: Finite interval. Typed, 13 pages (pdf). Notes taken by Henry Pollak at Bell Lab.
Item 124: The real axis. Handwritten, 4 pages (pdf). On the last page Beurling wrote: "Lecture notes taken by unknown from lectures at either Bell lab or Harvard, 48-49''