Just bought Amazon Kindle version and read it. Error in section 1072 where author describes size of possible Hiawatha Glacier impact crater asteroid as 31 km (18 mi); which is the size of the crater, not the potential asteroid. Unnecessary politically correct mentions of anthropological climate change; potentially to bolster standing within academic circles? Martin Sweatman presents a more comprehensive review of YDIH research references in his YouTube series entitled “The Younger Dryas impact debate research”. Randall Carlson provides a considerably greater scope of YDIH material in his older GeoCosmic REX and newer Kosmographia YouTube series.