web logs - strange stats "?src=QHA040" etc.

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I'm seeing these  lines in the output from Analog.
Has anyone seen this kind of thing?
[There is no code in that directory which would product the stuff
tacked on at the end.]

20     0.01%      /somedirectory/?src=QHA040
20    0.01%      /somedirectory/?src=QHA143

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