Invalid input: img/books/1238_front_thumb.jpg
. Please provide a comma-separated list of id values, or a single id value. An id value is a positive whole number.
"Simplicity in operation—because the masses are not mechanics."
Invalid input: img/books/1238_front_thumb.jpg
. Please provide a comma-separated list of id values, or a single id value. An id value is a positive whole number.