[Marxism] Popov's report - request for reference

[Gavin Walker]

Can any comrades help with the following bit of reference material?

In answers to written questions appended to his March 12, 1919 speech to the
Petrograd Soviet, Lenin references "Popov's report" on the taxes paid by
different strata of the peasantry. According to the speech, this report was
"repeated at a sitting of the Central Executive Committee in the presence of
workers."

After finding another mention of Popov's study of the Russian peasantry in
the years immediately before the revolution (though unfortunately without a
reference), I would like to try to find out exactly which Popov this might
be.

Can anyone with a better grasp of early Soviet history take a guess?
References in any language would be fine.

Thanks in advance and comradely greetings,

Gavin