Alien Skulls and Dropa Stones

3rd installment of secret space 2.
Ancient text can tell another story. A story that involves an Alien invasion many times in our history. The dropa stones for example are meant to be over 12 thousand years ago. And along with strange Alien skulls and art that has been found. Is this one of the biggest secrets that's that has been kept from humanity all this time?
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http://www.secretspacedvd.com/