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  1. The 30 Day Challenge Book: 500 Ideas to Inspire Your Life

  2. The Big Book of 30-Day Challenges: 60 Habit-Forming Programs …

  3. The Big Book of 30-Day Challenges: 60 Habit-Forming Pro…

  4. The 30 Day Challenge Book : 500 Ideas to Inspire Your Life - Google Books

  5. The Big Book of 30-Day Challenges by Rosanna Casper (Ebook

  6. The Big Book of 30-Day Challenges - hoopla

  7. The Big Book of 30-Day Challenges - Simon & Schuster

  8. 30-Day Challenges (67 books) - Goodreads

  9. 65 Amazing 30 Day Challenge Ideas to Improve Your Life

  10. The Big Book of 30-Day Challenges: 60 Habit-Forming Programs …