A 50 cm by 40 cm, black and white, aerial photograph of the Chalk River site mounted on matboard. The photograph is undated but bears an AECL number of 6406-4100-6. After about 1970, most Chalk River photographers labeled their photos so that the first four digits indicated the year and month – in this case perhaps 1964 June. The presence of the library auditorium (built 1957) and the absence of Building 600 (constructed 1967) indicate this to be the probable date.
