Slide collection Over 20,000 slides of school and other educational buildings including primary and secondary schools, nursery schools, special schools, libraries, overseas educational buildings; of activities in schools; school building systems; furniture; laboratories; further and higher education buildings. The slides were made mainly between the late 1940s and the mid 1970s. The collection is supplemented by material from other sources, such as plans and illustrations of schools built in the nineteenth century and early twentieth century. c. 1940s-1970s