Postcard; sketch of the first "Underground diagram" by Harry Beck, issued 1994 Pocket Underground map, December 1993. Poster; November update, unknown, 1993 Pocket Underground map, January 1993. Pocket Underground map, May 1994. Map; pocket Underground map, issued by TfL, June 2016 Map; pocket Underground map, issued by TfL, May 2017 Map; pocket Underground map, issued by TfL, May 2018 Map; pocket Underground map, issued by TfL, December 2016 Poster; Simply alfresco by tube and bus, by Glynn Boyd Harte, 1998 Map; Pocket Hampstead Tube map, 1907 Poster; Morden and Kennington extensions open August, unknown, 1926 Poster; London Transport, by Man Ray, 1938