Smith, Ian K., The clean 20 : 20 foods, 20 days, total transformation / Clean twenty Ian K. Smith, M.D. - First edition. - pages cm ISBN: 9781250182074 (hardcover) LCCN: 2017055140 Subjects--Topical Terms: Natural foods.Nutrition.Food habits.Exercise. LC Class. No.: TX369 / .S63 2018 Dewey Class. No.: 641.3/02