Ah Ha, ThibauT, you have opened a can of worms.
The Australia issues many stamps in WAG sheets. (Water Activated Gum) Then they
issue SA Coils and SA Books. (Self Adhesieve) The stamps from the coils and
books sometimes are indentical so if they are on cover one has no way to tell
if they are book or coil.
I have some used stamps taken from covers that have one round corner and three
square corners, most definately from a booklet.
I wonder where Rodney found the book he cut the stamps from!

Ralphael, the OLD master