Scope and Contents From the Sub-Fonds: The Air Photo library contains about 1.5 million black-and-white vertical aerial photographs of survey standard, suitable for viewing stereoscopically in 3D; most photos are at nominal scales of 1:30,000 – 60,000 and in 9” x 9” (230 x 230mm) format. Although mainly panchromatic, there is some infra-red, together with some black-and-white prints off colour or colour infra-red negatives, and a few colour prints. Nearly all the photography was taken for topographic or land-use mapping...