Unsurprisingly the Sheffield Star online archives only go back to 2001. Apparently the City Library has microfiche copies.
Britishnewspaperarchive doesn't seem to have anything that recent, but does have articles on Pooles Cavern from 1857 & Bagshawe in early 1900s.
Presumably the Grantham Journal would be a good place to look, but no idea where you'll find a copy (apart from local studies centre).