A 1939-1972
B 1933-1964
C 1942-1959
D 1945-1970
E 1949-1962
F 1945-1961
G 1950-1972
H 1931-1971
Hertzsprung, Ejnar 1937-1965
I 1956-1973
International Astronomical Union (IAU) 1960-1975
J 1931-1966
K 1935-1964
L 1929-1975
M 1931-1970
Marsden, B.G. 1960-1974
Maxwell, A.D. 1935-1941
McLaughlin, Dean 1940-1941
Merton, Gerald 1947-1958
Muller, P. 1949-1959
N 1924-1958
National Science Foundation (NSF) 1954-1962
O 1946-1967
P 1932-1965
Potwin, Leslie G. 1940-1944
Q 1957
R 1936-1974
Roemer, Elizabeth 1956-1960
Ross, F.E. 1951-1966
S 1931-1974
Schlesinger, Frank 1930-1936
Shane, C.D. 1938-1973
Stebbins, Joel 1940-1942
Strand, K. Aa. 1937-1961
Struve, Otto 1941-1955
T 1938-1964
U 1931-1950
V 1936-1964
Van den Bos 1947-1971
Vinter Hansen, Julie 1936-1958
W 1935-1973
Whitford, A.E. 1957-1966
Wright, W.H. 1938-1942
Y 1932-1956
Z 1931-1935
Group letters 1953-1960
Unidentified 1943-1972
"Observations for the International Longitude Operation" 1933
Comets 1939-1956
Mars 1953-1972
Scale Value 36" 1954-1957
Double stars 1952-1962
Personal 1907-1974
Correspondence 1907-1974
Pilot's kit, licenses 1940-1973
Receipts 1941-1961
Lick Observatory employment 1947-1958
Carmel house plans, blueprints undated
Student notebooks 1920
Hansen's General Perturbations 1920
Mathematics - Special functions 1920
Satellite Theory 1920
Photographs circa 1895-1965 and undated