Source: https://books.google.com/books?id=ePnR8OkiesAC OCRed text: https://books.google.com/books?id=ePnR8OkiesAC&pg=PP1&focus=viewport&output=text Alternative digitisations: https://archive.org/details/astatisticalacc01huntgoog https://books.google.com/books?id=HNgMAAAAIAAJ https://books.google.com/books?id=3YwBAAAAQAAJ http://stabikat.de/DB=1/XMLPRS=N/PPN?PPN=666165491