Four books from the Royal Tank Corp Museum before it was called Bovingdon Tank Museum. Asking just £5 each, most are for sale for significantly more.
Tanks of other nations: Germany 1969 52pp
Armoured cars 1900 - 1969 67pp
Tanks 1940 - 1946 36pp
Tanks 1919 - 1939 36pp
Weighs around 600g, postage at cost to me using RM48 tracked.