Naval Military Press might be able to help
This one's from the Russian viewpoint
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- The classic Russian account of their defeat at the outset of the Great War at Tannenberg and the Masurian Lakes. The double battle, won by the dual command of Hindenburg and Ludendorff, changed the course of the whole war.
It covers just 1914
and this one from the German point
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– War memoirs of Max Hoffmann, the brilliant German staff officer who devised the plan to encircle and crush the invading Russian armies at Tannnburg and the Masurian Lakes in Prussia in 1914. Betrays Hoffmann's bitterness that Ludendorff and Hindenburg got the credit for his victory. A few years after the war, when touring the field at Tannenburg, Hoffmann told a group of army cadets "See – this is where Hindenburg slept before the battle, this is where Hindenburg slept after the battle, and this is where Hindenburg slept during the battle."
Hoffman iirc spent the whole of his war on the Eastern front, so his covers a broader timeframe, but, again iirc, in some detail
And really quite readable