That was a very informative article! I have worked for a private museum and an institution with a research library, and and every time someone donated some professor's book collection when they passed, they accepted them. Look at all of that shelving space! Fill it up! The museum moved and the library was renovated, so I pitched thousands of carefully selected books. Old does not mean valuble with books folks. The sheer mass of a library's collection is crazy when you have to physically move it.