[Central Office of Information collection of photos, prints, transparencies and slides of technical and scientific subjects. Selected from former C.O.I. photograph library. Chiefly 1970s? Some of the images are historical, although the prints (i.e. engravings) are mostly from printed books and encyclopaedias. Subjects include portraits. The C.O.I. photo library hired out stock for reference purposes until its closure in 1988. 484 files in 50 boxes, listing available]