Image and information supplied by Igor Andronov.

One of the required books you had to have when you came to CSTS is a copy of the 'Pocket Oxford Dictionary'.
I can tell you that it did not fit into an eleven year-olds pocket and was a considerable weight. This copy survives... just.

(Click over the image to enlarge)

...additional image supplied by Tim Ecott.

Here is mine - the 'Concise' version. Also surviving, and seemingly the same size and weight - and in slightly better condition, and obviously used as a coaster at some time in the past...

(Click over the image to enlarge)