If you use EVERNOTE to keep track of your "research in progress" perhaps this article will help:
Source: How to Create Notebook Stacks with Evernote where we read:
"Sometimes, you have notebooks that contain a common theme. Perhaps you’re working on blog posts for the month of January and you want to work closely with your notebook that lists content ideas.
What then follows are directions for accomplishing this on a Mac and a PC.
With Evernote, you can group notebooks together so you can access them easily."
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