If you need a good quilting reference book
 

The "All-in-One Quilter's Reference Tool" is excellent.
For those who have trouble doing the math for yardage or
to calculate the size of a quilt with sashing or on point, etc.
There is so much in that little book. Lot of charts for cutting
different shapes, etc. Worth every penny.
No affiliation whatsoever.
My only complaint is that the print is very small.
Get your magnifying glass ready.https://cdn.quiltingboard.com/images/smilies/smile.png

I bought https://m.media-amazon.com/images/I/..._AC_UY218_.jpg when it was recommended by Mark Lipinski a long time ago. It is out of print now I think but new versions are available. I keep it in on my cutting table. Mine isn't small but not big as a book either, has good size text and spiral bound, perfect reference.