- FondsRU-RNB/531 - Avraam Sergueïevitch Norov, letters
- DossierRU-RNB/531/427 - Letters by Leonid Kavelin sent to A. S. Norov from 1860 to 1865
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- PièceRU-RNB/531/427-ff. 11-11v - Letter dated February 28, 1862
- PièceRU-RNB/531/427-ff. 24-25v - Letter dated May 18, 1864
- PièceRU-RNB/531/427-ff. 26-27v - Letter dated June 11, 1864
- PièceRU-RNB/531/427-ff. 28-29v - Letter dated March 4, 1865
- PièceRU-RNB/531/427-ff. 30-30v - Letter dated September 8, 1865
- PièceRU-RNB/531/427-ff. 32-35v - Letter dated November 2, 1865
- PièceRU-RNB/531/427-ff. 36-37v - Letter dated December 12, [1864]
- PièceRU-RNB/531/427-ff. 40-41v - Letter without any date, probably from [1864-1865]
- PièceRU-RNB/531/427-ff. 161 - Letter without any date, probably from [1864]
