i don't know but i can tell you after purchasing the book that it is a ripoff. dr. tenpenny wrote less thn 200 pages of this book which could be easily be condensed down to 100 pages if you reduced the 1.5" margins and the extra large print. she wrote it like i wrote term papers if the margins and font weren't specified by the instructor. for someone with supposedly altruistic motives this seems an inexcuseable display of greed. i have been ripped off and i am embarrassed for dr. tenpenney.
You may purchase the book direct from her website at www.drtenpenny.com. I believe the cost is $39.00. I do agree that this book is expensive. Purchase Neil Z. Miller's book, "The Vaccine Safety Manual" for much, much less. Stay healthy! =) You may also visit www.childhoodshots.com. Mary Tocco's site is wonderful as well!