The History of the Postmarks of the British Isles from 1840 to 1876 - John Hendy (1909)

34 THE POSTMARKS OF THE BRITISH ISLES FROM mO.
existed between the Post Office and the Illustrated London News, the London Times,
and the Stamford Mercury, which permitted them to circulate through the post under
Book-post regulations, and to obviate the necessity of putting postage labels on each
paper, the publishers were permitted by the Postmaster-General the use of special
stamps. There were three values of these stamps— id., i^d., and 2d., as shown in
Figs. 162-164.
^m