I came up with this link. All one line. Readable version online from google == click on the icon. Introduction has TONS of data re early number schemes ==probably more than you ever wanted to know! http://trove.nla.gov.au/work/663957?l-availability=y%2Ff&l-language=English%2C+French&q&l-format=Book%2FIllustrated&c=book Mike in Plovdiv