Forum Moderators: mack
It's only duplicate content if the same content can be referenced by more than one URL. For example, if you have the same page that is linked to by testpage.htm and TestPage.htm and TESTPAGE.htm, that's considered 3 pages by SEs (even though it's the same page on Windoze boxes). It's more of a problem for dynamic sites, where the same content may be shown by /products/widgets/green/ and widgets.php?color=green and speacials.php?type=widgets&color=green
The concern is not multiple click paths to the same content. The concern is more than one ADDRESS for the same content.
What you describe does not sound like the second situation. You can create three "index_by" pages that do not have substantially identical content, even if they all do link to the same poems.
The same is true on the web. to many links will not harm you, but only link where appropriate. If you think a internal link will benefit your users then use it.
Mack.
Lets imaging your pages are towns and your links are roads. A town can have many roads leading to it but it is still only one town. In fact the more roads lead to it the more traffic can drive in. Sounds good huh!
If I want to go from point A to point B, I don't want to wade through 40 pages of different directions showing me indirect ways, backtracks, and detours. The SEs understand that, so the indirect/duplicate routes will be pushed down in the rankings.