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Which one is correct?

I visited four countries over the period of 2010 to 2014.


I visited four countries over the period 2010 to 2014.

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Neither is very idiomatic to me. I'd say either, “I visited four countries between 2010 and 2014” or “I visited four countries from 2010 till 2014”. In fact I probably wouldn't even say the latter of those two—it feels much less natural than using between… and does. – Janus Bahs Jacquet Jul 13 '14 at 9:30
Also, "during the period" is more idiomatic than over, for this usage at least...I'd expect "over" when you're talking about trends or statistics, such as "there was a fourfold increase in tourism over the period" – JeffSahol Apr 9 '15 at 17:54
@JanusBahsJacquet I was just going to add an answer that can only be considered a rephrasing of your comment, I think you should definitely add between ... and as an answer, in fact, your comment has more upvotes than the all answers. – Mystic Odin Apr 20 at 9:27

I see more of sentences like "I visited four countries over the period of 4 years", which, I certainly believe, must be the correct version.

First off, 'over the period' means summation of a period of time. So I see no reason someone should section the period of time already merged, especially when the expression has to do with 'over the period'.

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"over the period of 4 years" sounds awkward to my ear. "Over a period of 4 years" sounds more "correct." – Lumberjack Apr 15 '15 at 18:52

Both seem correct to me. But

I visited four countries over the period of 2010 to 2014.

sounds more correct.

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