Title: Pi︠a︡tidesi︠a︡tili︠e︡tnīĭ i︠u︡bileĭ akademika Nikolai︠a︡ Ivanovicha Koksharova, 6-go īi︠u︡ni︠a︡ 1887 goda i kratkai︠a︡ bīografīi︠a︡ i︠u︡bili︠a︡ra