Cambridge Dictionary Of American English Student Activity Book
Student Activity »

Focus On Grammar
Level 1 »

Vocabulary in Use Intermediate
Reference and Practice for Students of North American English »

Vocabulary in Use Intermediate with Answers
Vocabulary in Use intermediate, part of the North American English edition of the English Vocabulary in Use series, is available with and without answers. »

Basic Vocabulary In Use With Answers [with Cd]
With Answers with CD (Audio) »

Vocabulary in Use Upper Intermediate with Answers
This book is an American English equivalent of English Vocabulary in Use. The left-hand pages present and explain new words and phrases (up to 3,000 new items). »