This book is the book which lists the possible rate and fee combinations which could be paid for by a single (solo) stamp of the Prexie Series.

This book cannot be beat by a single subsequent publication. That is also why, issued in 1994 it is an elusive title to buy.
There is also the series of publications, 97 running from 1991 into 2022, of tThe Prexie Era Newsletter which can be found here online and downloadable for free:
https://www.usstamps.org/resources/prexie-era/ It stopped being published when the then current editor retired and there was no volunteer to replace him.
EDIT: Your, OP, find of a 14 stamp used coil strip would have made a nice short article there.