example an eBook of filename 10234 would be found at:
http://www.gutenberg.org/dirs/1/0/2/3/10234
or filename 24689 would be found at:
http://www.gutenberg.org/dirs/2/4/6/8/24689
An alternative method of locating eBooks:
http://www.gutenberg.org/dirs/GUTINDEX.ALL
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