• Una Visita Por El Museo
• Una Visita Por El Museo / a Visit Through the Museum
• Una Visita a / a Visit To; Pebble Plus Bilingual
• Una aventura de Arturo
• Unabridged Classics (Go Reader)
• Unabridged Classics in Audio
• Unbeatable Story
• Uncle Duncle Chronicles
• Uncle Scrooge (Graphic Novels)
• Uncover Books
• Uncovering History
• Uncovering Series
• Undead
• Undead Pets
• Under the Sea
• Undercover Girl
• Underland Chronicles
• Understanding
• Understanding Christianity
• Understanding Diseases and Disorders
• Understanding GCSE Geography (for AQA A)
• Understanding Global Issues
• Understanding Ingredients
• Understanding People in the Past
• Understanding Philosophy
• Understanding the Elements of the Periodic Table
• Understanding the Elements of the Periodic Table: Set 3
• Understanding the Human Body
• Undertown
• Underwhere
• Underwhere Series
• Unearthly
• Unfabulous
• Unforgettable Americans
• Ungoo
• Uni-Taschenbücher
• Unicorn Chronicles
• Unicorn Club
• Unicorn School
• Unicorn's Secret
• Unicorns of Balinor #3
• Unicorns of Balinor #8
• Universe
• Universe Publishing
• University of California Publications in Linguistics
• University of California Publications in Zoology
• University of Massachusetts Occasional Papers in Linguistics
• University of Nebraska Press
• University of Wales - Religion, Education, and Culture
• University of Wales Press - Media Languages