That is, while these books may not be on the shelves of your local public library, there is a good chance they can be found in an academic library or requested through Interlibrary Loan.
Some works are in languages other than English.
The English Experience, Its Record in Early Printed Books Published in Facsimile 834. W. J. Johnson, 1976. A Medieval Feast. Anderson, John L. A Fifteenth Century Cookry Boke. New Discovery Books, c1995.