On the centre tables you'll find black ring-binders which contain an index of key subjects. The class references in this link to a sequence of box files and filing cabinets of cuttings, pamphlets etc. Other metal cabinets hold photos, drawings etc. and may have what you're seeking.
Meanwhile I expect some of the Council's LH publications will have something on these topics. If you speak to the library staff they'll advise you on that aspect and generally.