The Seventh Edition offers a word list with more than 20,000 entries. This edition also includes a comprehensive reference section. In addition, the endpapers offer tables of state abbreviations, and the English and metric systems of weights and measures.
I remember studying and scanning this book for hours at end. I was entering a contest in a magazine in which you had to find as many words as you could using only the letters of the magazine's name. I had a lot of fun in that contest but unfortunately, I didn't win. I forget how many words I found but this book helped me a lot.