Given that this is a right secured only from federal infringement, it says that the federal government shall not interfere with the state constructing and stocking libraries for use by the people. Certainly, as with the first amendment restrictions, the federal government can reasonably restrict the kind of books the state library carries.
Now, if the state wishes to allow people to purchase their own books, keep them at home, carry them around, or set a minimum age for buying and reading books, well, the states retain their police powers to do that.
IF the argument had been made that the restrictions in the 1st ammendment pertained to free speech exclusively (therefor exposing the need for such an ammendment), I wonder what debate the Founding Fathers would've had regarding the nuances and subtleties respecting either of our nominations for such ammendment.
Just for arguments sake, suppose the adage: "The pen is mightier than the sword" carried significant weight, and therefor was an issue of contention.