It is believed during the last Ice Age that a thousand-mile wide land bridge connected Siberia and Alaska, creating a region known as Beringia. A procession of large mammals and humans are also believed to have crossed this bridge to America. This text seeks to bring current information form both Russia and America to this debated topic. It documents the research carried out since 1970 in both Siberia and Alaska. More than 50 contributors' work is included together with numerous photographs, maps and line drawings.