The Scans on the Internet Archive
The Printed Book
My earlier article on the The Dominican Little Office
Here is my copy of The Divine Office: Explanation of the Psalms and Canticles, by St Alphonsus Liguori
The scans are still on the internet archive - it’s volume 14 of the Complete Works of St Alphonsus Liguori.
This book from Barnes & Noble seems to be the same book.
There are other reprints available on other popular online bookshops.