Survey Files Survey material from field trips organised by LePlay House and the Institute of Sociology between the 1920s and 1950s. The material relates to the British Isles and Europe as well as Africa, North and South America, Asia, and Australasia. The series includes administrative papers, survey material and reports on the groups' findings. There are also collections of survey materials from places never visited by the groups; these come under 'small surveys'. 1869 - 1957