http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Slovarʹ oper, vpervye postavlennykh ili izdannykh v dorevoli︠u︡t︠s︡ionnoĭ Rossii i v SSSR, 1736-1959
From the Estate of George and Mathilda Sabo by Dr. Joseph R. Corcoran & Irene Sabo Corcoran and Family. September 1998.