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.B asin
is the unique ID Amazon assigns to each product. It is 10
characters long. It can be found by looking for the
-\'/xxxxxxxxxx/\' part of the URL of its Amazon page.
+\'/xxxxxxxxxx/\' part of the URL of its Amazon page. In
+the case of a book it will generally be the same as the
+ISBN-10 number.
.SH EXAMPLES
.TP
.B download all available pages of a book