Text ( visual ) : unmediated The organisation of British Railways / Michael R. Bonavia. -- London : I. Allan , 1971. -- 192 p : maps ; 24 cm. -- Based on the author's thesis, University of London ; Bibliography: p. 185-188 ; Includes index. -- ISBN 0711001987 ; (BA27443458) ; https://ci.nii.ac.jp/ncid/BA27443458 Author Heading(s): Bonavia, Michael Robert. -- Classification(s): LCC : HE3016 ; DC : 658/.91/3850942. -- Subject Heading(s): LCSH : British Rail (Firm)