A lovely little black and white version of the Tube map at the front of a 1948 year diary. Drawn by H.C. Beck (see his name at the bottom left), it shows the central area of London only and is based off the 1946 version of the full map. By 1949, interchanges were being drawn with a white connector line between adjacent circles, rather than the separate circles seen here.

Source: hollandfamilyarchives/Flickr