From Wikisource

Works

Poetry

• Poems (1909)
  • The Uses of Poetry
  • On a Proposed Trip South
• The Tempers (1913)
  • Peace on Earth
  • First Praise
  • Hic Jacet
• Al Que Quiere! (1917) – 52 poems
• The Young Housewife (1916)
• Portrait of a Lady (1920)
• Sour Grapes (1921) – 53 poems
• Spring and All (1922)
  • The Red Wheelbarrow
• Paterson (1946–58)
• Pictures from Brueghel, and Other Poems (1962)

Novels

• White Mule (1937)
• In the Money (1940)
• The Build-up (1952)

Other works

• Autobiography (1951)
• Selected Essays (1954)
• Selected Letters (1957)
• The Farmers' Daughter (1961) – a collection of short stories

Source

http://www.theotherpages.org/poems/poem-wx.html#williams

Some or all works by this author are in the public domain in the United States because they were published before January 1, 1923. The author died in 1963, so works by this author are also in the public domain in countries and areas where the copyright term is the author's life plus 30 years or less. Works by this author may also be in the public domain in countries and areas with longer native copyright terms that apply the rule of the shorter term to foreign works.