The number of pages in Helen Keller's book depends on the specific book you are referring to. Helen Keller wrote several books and articles throughout her life, including "The Story of My Life," "The World I Live In," "Three Days to See," and others. The number of pages in each book can vary depending on the edition and format (e.g., hardcover, paperback, audiobook, etc.).
For the most accurate information, I recommend that you refer to the specific edition of the Helen Keller book you are interested in. You can check the details of the book, including the number of pages, by searching for the book title and edition on reputable online bookstores or library catalogs.