Here's an attempt to straighten out this argument about "circa" -- both sides are right because you are talking about two different things.
Early on in the thread the quote is "circa 1910s" -- notice the "s" on the end. Yes, circa 1910s would refer to anything from that decade, just like circa 1960s would pertain to something from 1960 or 1968.
In the last couple of posts, somehow the "s" was dropped and it was changed to circa 1910. Yes, that would pertain to something within a couple of years plus or minus of 1910.
Greg
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