Publications.

Bangor Welsh Manuscripts Society , Bangor, Wales , Bangor Bangor Welsh Manuscripts Society , Wales, Dept. of Pathology, George Henry Penn, British Film Institute, Astronomical Institute, University of Nottingham Dept. of Agricultural Economics , Dept. of Agricultural Economics, Radio Astronomy Institute , Cooperative Extension Service, Cornell University, Tulane University, Masarykova univerzita v Brně , University of Nottingham, Stanford University, Michigan State University , Medical College