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I was wonder why I receive the following message.

Warning line 1 No Society specified, using generic APS style. 

Here is my code:

\documentclass[apl, aps4, twocolumn, superscriptaddress]{revtex4}

As far as I know I have specified apl style.

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Welcome to TeX.sx! Please add a minimal working example (MWE) that illustrates your problem. It will be much easier for us to reproduce your situation and find out what the issue is when we see compilable code, starting with \documentclass{...} and ending with \end{document}. – Jubobs Mar 27 '13 at 13:49
@Jubobs For once, a MWE is not quite so important (you only need to add \begin{document} to the above so TeX writes to the log to see the message). – Joseph Wright Mar 27 '13 at 13:56
The apl style is not specified in a way recognised by revtex latex says LaTeX Warning: Unused global option(s): [apl,aps4]. – David Carlisle Mar 27 '13 at 13:57
@JosephWrigt Yes, you're right. I initially thought that the warning was issued by the class because it expected the OP to redefine some macro in the preamble. I was wrong. – Jubobs Mar 27 '13 at 13:58

If you look a little further through the log, you'll find it reads

Class revtex4 Warning: No Society specified, using generic APS style.


LaTeX Warning: Unused global option(s):

Notice that neither apl nor aps4 are recognised. Changing the input to

\documentclass[apl, aps, twocolumn, superscriptaddress]{revtex4}

removes the 'No Society' warning and gives

LaTeX Warning: Unused global option(s):

So the warning is telling you something: you're using option names that the class does not know, and that means it's falling back on a generic format.

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Regarding that second warning, the class defines a macro called \apl but there doesn't seem to be a class option called apl. – Jubobs Mar 27 '13 at 13:56

Compiling your document I get:

Class revtex4 Warning: No Society specified, using generic APS style.
LaTeX Warning: Unused global option(s):    [apl,aps4].

You need to use revtex4-1:

share|improve this answer
The option aps4 still seems to be unknown, and fails if you give it before aip. – Joseph Wright Mar 27 '13 at 14:02

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