"Secret Mars: The Alien Connection" by M. J. Craig (Revised & updated edition 2017) is now available in hardcover edition from Amazon and all bookshops worldwide.
Hardcover edition: https://www.amazon.com/Secret-Mars-Alien-Connection-Craig/dp/1916225802
Paperback edition: https://www.amazon.com/dp/1916225810
Full Book Details: https://www.secretmars.com/buy-secret-mars