The Beginning of the World: A Scientific Study of Genesis 1-11 by Dr. Henry Morris is available for free at Creation Conversations in MOBI, EPUB, and PDF formats here.
Update May 2015: This link still links to the Creation Conversations page offering this book. I am not sure if Creation Conversations still intends to provide the book for free at this time. If you wish to download the book, please visit Creation Conversations and contact them regarding any copyright concerns. Thank you!