Conscious Choice:

The Origins of Slavery in America and Why it Matters Today and for Our Future in Outer Space

Retail Price：$3.99 Available in pdf (PC & MAC), epub (iPad, Nook, and most ebook readers), mobi (Amazon Kindle).

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Genesis:

The Story of Apollo 8: The First Manned Mission to Another World

Retail Price：$5.99 Available in pdf (PC & MAC), epub (iPad, Nook, and most ebook readers), mobi (Amazon Kindle).

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Leaving Earth:

Space Stations, Rival Superpowers, and the Quest for Interplanetary Travel

Retail Price：$3.99 Available in epub (iPad, Nook, and most ebook readers), mobi (Amazon Kindle).

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