The Humason papers have been arranged, with only minor changes, according to the manner in which they had been found in the attic of the Carnegie Observatories. The correspondence covers the years 1930-1952. It contains both incoming and carbons of outgoing correspondence. They are broken into six chronological groups, arranged in the boxes as follows:

Box 1: 1930-1947, 1948

Box 2: 1949

Box 3: 1950

Box 4: 1951

Box 5: 1952

Milton La Salle (his middle name has also been cited as Lasell) Humason was a staff astronomer for the Mount Wilson [& Palomar] Observatories throughout his entire astronomical career. Humason is remembered chiefly for his collaboration with Edwin P. Hubble in the field of observational cosmology. Perhaps his most notable accomplishment, however, was his rise from mule-driver and janitor at Mt. Wilson to the position of astronomer with the lack of even a high-school education. It was a feat remarkable for the time and will probably never be matched.

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