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Visit the product page, then scroll to the bottom of the page where it lists the associated product formats.
Click the product format in question.
On the product format page, click the Distributions link in the right sidebar.
View the associated distributions.
You can further filter the distributions by specifying a specific Channel in the search form at the top of the page. In the example below, we're viewing the distributions of the Windy City title to Follett.