G. D. H. Cole 
British Trade Unionism To-Day [PDF ebook] 

First published in 1939. This book provides a balanced picture of Trade Unionism as it was in the 1930s, both in general and in each of the principal industries and services. The study opens with a brief outline of Trade Union history, before examining Trade Unions in various industries, including mining, transport, and the postal service. British Trade Unionism To-Day will be of great interest to students and scholars of labour and political history.