Each Post in Life and Letters can be assigned to multiple Categories and also to Issues. Issues are similar to Categories, but have a few additional properties:
Cover Image
This should be displayed on the home page and also on the Archive page (the page that displays all the Issues)
Publication Date
Issues are sorted on the home page and on the Archive page by their Publication Date.
Download
A pdf or other file representation of the Issue. Can be downloaded from the Issue page.