This one was published around 2015.

336-page hard cover book that looks at every song that The Seekers have recorded.

Lots of history, trivia and memorabilia.

Still available from Amazon for around $40-$50 new (less for used) or at a considerably higher price if you want one personally autographed from The Seekers' website.

I bought one for a good friend of ours as well as an avid Trio fan a few years ago.