Where tables or images split them, the text was moved to rejoin
paragraphs. The List of Publications before the article was moved
down to rejoin the portion after the end of the article.
Table 6 re-arranged due to use of vertically printed text. Tables 18
and 19 rearranged due to width considerations in text version.
Page 451 may have a typo "...wide range of error arising from
insufficiently =small= samples..." should probably have been
"...=large= samples..." (emphasis added here). This was left as is.