‏‫‬‭The British National Bibliography cumulated subject catalogue 1968-1970 : a cumulation in one sequence of the Classified Subject Sections of the three annual volumes of the British National Bibliography for the years 1968-1970, covering the British publications of those years received by the agent for the Copyright ‭‬Libraries. Vol. 2, Class 600 to Class 900‬‭‬‭‬/a.j.weils