MLS of man entering darkroom carrying box of film, two laboratory technicians standing by. CS of man at dryer with prints. MS of man putting photos on pile of prints. Shots of man entering darkroom, drawing curtain. MS of mosaic on copy stand, man in foreground giving signal and lighting flashes as mosaic is copied. Two shots of man setting lens on copy camera. Shots of technicians copying mosaic. MS of man working at enlarging in darkroom. MS of truck, sign "The Photographic Survey Corporation Limited Toronto" on door. TILT UP from photographs to general view of mosaic room. MS of girls at work on photographs in mosaic room. Several shots of people at work in mosaic room. MCS of draftman at work with map. CS of draftsman's drawing lines on map.