"1951Z"^^ . "Olf, Mark"@en . "1905-05-15Z"^^ . . "Mark Olf (May 15, 1905 - June 7, 1987) was a Jewish folksinger and recording artist. Accompanying himself on the guitar, Olf documented and preserved Yiddish and Hebrew folk songs, many of which he had heard as a child in Russia."@en . . . "Singer" . "1907Z"^^ . . "1987Z"^^ . "solo_singer" . . . "Mark Olf"@en . "1907-06-07Z"^^ . . "1905Z"^^ . . "1987-06-07Z"^^ . "Mark Olf"@en . .