Look how low :

Some of these Clubs Crowds were :

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Some great names from the past there, including former Bluebird Billy Kellock notching a pen for Halifax Town.

Some other notables who went on to bigger things...
Perry Groves at Chester... later Arsenal
Trevor Morley at Northampton Town... later Man City and West Ham
David Platt at Crewe Alexandra... later Aston Villa, Arsenal, Nottingham Forest, a couple of Italian sides, England and Coronation Street!

We lost 1-3 at home to Notts County on front of 2,410 on that day. Worse was to come with crowds going below 2K now and then. Went down to the 4th for the first ever that season. Then came Frankie Burrows.

I think you are getting a similar feed I get, results from the 70s and 80s, attendances in the First Division by the late 70s were poor too.