"1907Z"^^ . . "Biiber, Valter"@en . . . "1977Z"^^ . . . "Estonian footballer" . . "Valter Biiber"@en . . . "Valter Biiber (31 August 1907 in Narva \u2014 8 September 1977 in Tallinn) was an Estonian football player."@en . "1907-08-31Z"^^ . . . "1977-09-08Z"^^ . . .