The library of congress is selective and does not have copies of every book ever written. They are quite clear about this in their selection process. This is

The library of congress is selective and does not have copies of every book ever written. They are quite clear about this in their selection process. This is a myth which sounds right, but is not accurate. They could not afford this, nor does it make practical sense. https://www.loc.gov/loc/lcib/9709/acquire.html https://www.loc.gov/loc/lcib/9709/acquire.html