I maintain a large number of notebooks for a variety of purposes, so many that it is often difficult to keep track of them all. There is also a notebook graveyard in a cupboard where completed and defunct notebooks go - because you never know, right?
For a few years now I have been using a simple system to keep it all under control. This all starts with a label. I regularly print sheets of these:
Every time I unwrap a notebook of any sort, I stick one of the labels on the inside back cover of the book and fill it out. At the same time, I update an Excel file that catalogues all my notebooks. Here is an extract:
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If I ever need to refer back to notes I remember making in an old notebook this system makes it easy.