Hello all, I'm currently in the capstone course for the history track in a university. The whole semester is essentially building up one essay, and my essay is generally on the topic of war material aid (not just American lend lease, other nations provided aid too) which was provided to the Soviet Union during WW2. More specifically it is seeking to show facets of the aid it being particularly important or needed in opposition of the general Soviet stance that the aid from western allies being of minor importance. Facets of note seem to be aviation, expertise and trains/logistics.

The problem I am facing is that, at least for my university's catalogue of resources, there are few sources to be found about the topic. I am unsure what other databases I could even search for finding sources, and I would not have direct access to them as my school does not have them on hand. Be that as it may, as long as I know what I am looking for I can simply request an interlibrary loan and get whatever it is pretty quickly. Therefore, I am asking for sources in the style of scholarly articles or scholarly style books which may be relevant. Thanks for any help.

As a side note, primary sources beyond the boatload of lend lease things I've found on the FDR museum website are hard to come by. Any recommendations? Are there translated Soviet documents available?

TLDR: Need sources to show lend lease and other aid was helpful to the Soviets in WW2, perhaps not immensely overall but in select areas it does seem to have been of notable importance. Looking for scholarly style things, books and journal articles, and if you know any primary sources which can be accessed online that would be awesome.