Books like Gaining Word Power
Dorothy Rubin
Gaining Word Power is 397 pages, about 7 hours 17 minutes at 250 words a minute.
12 books to read next
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SAT Vocabulary 2.5 h -
Concepts and Comments 4.1 h -
Essential Academic Vocabulary 4.4 h -
English Vocabulary in Use 3.1 h -
Recycling Your English 3.1 h -
504 Absolutely Essential Words 2.6 h -
Vocabulary Workshop 3.5 h -
English for Everyone 6.6 h -
Achieve IELTS 1.8 h -
Academic Vocabulary 3.4 h -
The Least You Should Know About Vocabulary Building 3.2 h -
Be a Better Reader 3.2 h
How long each takes
SAT Vocabulary 2.5 h 
Concepts and Comments 4.1 h 
Essential Academic Vocabulary 4.4 h 
English Vocabulary in Use 3.1 h 
Recycling Your English 3.1 h 
504 Absolutely Essential Words 2.6 h 
Vocabulary Workshop 3.5 h 
English for Everyone 6.6 h 
Achieve IELTS 1.8 h 
Academic Vocabulary 3.4 h 
The Least You Should Know About Vocabulary Building 3.2 h 
Be a Better Reader 3.2 h Bar height shows length. Estimated at 250 words a minute.