Yes, I have that problem also. That was going to be another topic. :-)

I do those by year, by "the named magazine."

Using a notebook sounds like a great idea. I have been known to purchase the same magazine, the same book, the same quilting notion.

This could help me. Thanks for the idea.

Wonder if I can keep track of a small notebook! :-)

My "library" is a mix, some:
By Author: Got a lot of Eleanor Burns
By Type: Scrappy Quilts, Bargello Quilts, Log Cabins, Baby Quilts
Then the single types like books on Color Theory, Paper Piecing, etc - they're on the bottom shelf

Mine are mostly Quilt In A Day books so they are all togather.
I would like to find a way to sort by blocks and block sizes. Seems Im always looking for a particular block and the size I need it to be.