It means that book was considered integral to that year.
"Our aim in Education is to give a Full Life." -- Mom to 4 AO Graduates, Grandma to 3
"Practically, nearly, almost and in all ways visible to normal mortals Invincible" (due to the diplomatic immunity of Admin.)
"Practically, nearly, almost and in all ways visible to normal mortals Invincible" (due to the diplomatic immunity of Admin.)