Columbia subject headings:
Sandburg, Carl, 1878-1967.
Harvard subject headings:
Biographers--United States--Correspondence.
Poets, American--20th century--Correspondence
Sandburg, Carl, 1878-1967
Sandburg, Carl, 1878-1967--Correspondence.
Princeton subject headings:
Biographers--United States--Correspondence.
Poets, American--20th century--Correspondence.
Sandburg, Carl, 1878-1967--Correspondence.
Sandburg, Carl, 1878-1967.