Here are the possible solutions for book size in printing clue
Answer
Clue
Relevancy
quarto
Clue
Book size, in printing
Book size in printing
Definition
a book size made by folding sheet into four leaves
errata
Clue
Printing after a printing
Definition
a list of printing errors
ltr
Clue
Size that's usually perfect for printing crosswords, but often not for mine because I tend to write really long clues and you might need more space, for short
Printing paper size (abbr.)
pica
Clue
Printing size
Definition
an old type size, approximately, and still used synonymously for, 12-point