Report of the Director to the Board of Trustees for the year ... / Chicago Natural History Museum.

1962

Report of the Director to the Board of Trustees for the year ... / Chicago Natural History Museum.

1950

Report of the Director to the Board of Trustees for the year ... / Chicago Natural History Museum.

1944

Report of the Director to the Board of Trustees for the year ... / Chicago Natural History Museum.

1954

Report of the Director to the Board of Trustees for the year ... / Chicago Natural History Museum.

1956

Report of the Director to the Board of Trustees for the year ... / Chicago Natural History Museum.

1943

Report of the Director to the Board of Trustees for the year ... / Chicago Natural History Museum.

1948

Report of the Director to the Board of Trustees for the year ... / Chicago Natural History Museum.

1957

Report of the Director to the Board of Trustees for the year ... / Chicago Natural History Museum.

1945

Report of the Director to the Board of Trustees for the year ... / Chicago Natural History Museum.

1947

Report of the Director to the Board of Trustees for the year ... / Chicago Natural History Museum.

1955

Report of the Director to the Board of Trustees for the year ... / Chicago Natural History Museum.

1946

Report of the Director to the Board of Trustees for the year ... / Chicago Natural History Museum.

1963

Report of the Director to the Board of Trustees for the year ... / Chicago Natural History Museum.

1961

Annual report of the Director to the Board of Trustees for the year ... / Field Museum of Natural History

9, no. 2