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Back issues of "Over the Front" and "Cross and Cockade" I think have some articles on the IM series of bombers.
The Durkota book is good, especially for an overview of Russian aircraft companies, though it is bit thin on hard stats.
The US Military Attache Reports at the National Archives in Washington DC have some good stuff on the pre-war Russian AF, including a file on the Ilya Muromets. Sikorsky's own book _Story of the Winged S_ and N. K. Finne's _Igor Sikorsky: The Russian Years_ are also well worth the time to look at.
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