How you would help a retired math professor that has a collection of books gathered over a lifetime? They are all math/physics related and many were passed along from other colleagues. Their hope is to pass them along in the same way. They cover three walls of a small office.

He mentioned that pre-covid, he would have left them in boxes outside the office for a few semesters and pass along the rest. Also that students that would send them back to their home countries to setup small libraries. A book dealer helped catalog them but said they were domain specific and hard to sell locally.