You may find this past discussion enlightening. (Courtesy /u/iHistorian and /u/Georgy_K_Zhukov) It includes a couple of very specific articles, including Alexander Hill's frequently-cited "British Lend-Lease Aid and the Soviet War Effort, June 1941–June 1942" and Boris Sokolov's "The role of Lend‐Lease in Soviet military efforts, 1941–1945." Sokolov I would take with a grain of salt. He's a Russian revisionist historian, and many of his works focus on revising or challenging the prevailing heroic, patriotic narrative of the war in Russia, which is the official narrative of the Russian state. However, this valid & important task has led him into some questionable territory. He has some claims similar to "Viktor Suvurov"/Vladimir Rezun's Icebreaker conspiracy theory, except he has gone further to claim that Stalin originally intended to invade Germany in 1940 during the French campaign, but the French surrendered too quickly for the surprise attack. His casualty figures for the Red Army are also three times higher than any of the generally-accepted figures like Krivosheev. But, the Lend-Lease article is overall pretty good; just bear in mind that there is a particular revisionist perspective, though of course historical revisionism is a good and necessary thing.