Extraterrestrial civilizations in human history

This scientific and popular book is devoted to the issue of a complex and important. However, science is engaged in extremely reluctant, only a few scientists are perfected to step up on the pissile soil of legends, myths, religions, stupid facts and hypotheses, which can be attributed to fantastic.
Throughout history in different countries, reports of aliens on Earth periodically appeared, which is confirmed by the originals of various documents.
This book will open the curtain of secrecy, will show the true role of alien civilizations in human history, will help to distinguish historically reliable facts from the myths and legends. After reading it, you will take a fresh look at the history of human civilization