Library of Congess Number

Many authors today don’t even realize how important it is to have a Library of Congress Control Number (LCCN) or why it’s important.
 
Put plainly, it is the number that shows to the government that your book exists; more importantly, it is the number that any library you are hoping to get into wants to know that you have.
 
If your package does not already include this service, we strongly recommend taking it as an add-on!