The hat

The most complete records first.

• 
  Format not recorded · 1970Parents' Magazine Press · 32 pages
• The hatTomi UngererUngerer

  H
  Format not recorded · 1982Four Winds Press · 32 pages
• The hatTomi UngererUngerer

  H
  Format not recorded · 1974Puffin Books · 34 pages
• The hatTomi UngererUngerer

  H
  Format not recorded · 1971Bodley Head · 32 pages

Editions and their details come from Open Library, as its contributors recorded them. Publisher names are shown as recorded. See this book on Open Library(opens Open Library)