Looks a bit 'agricultural' doesn't it? I imagine one operates the threshing machine, another makes sure the baler is baling OK.........
One station will be communicator- they used to have a separate Radio Operator for language difficulties. They used to have a Navigator station with wonderful ADF sets on enormous compass scales. One will certainly be a Loadmaster and one a Flight Engineer- I would not expect a 70s aeroplane to have the degree of automation we in the west take for granted now.