In is quite often used with the plural pages but not with the singular page. Page isn't the only word that behaves a little erratically in this respect. Another one that comes to my mind is mountain: He has a cottage on the mountain.
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Cool Breeze
He has a cottage on the mountain. (1)
He has a cottage in the mountains. (2)I am not sure but (1) and (2) seem to differ in meaning a little?
Cool BreezeI wouldn't say on the mountains at all.I see.