. . "1899Z"^^ . "Tjabel Boonstra (4 June 1899 \u2013 18 May 1968) was a Dutch cyclist. He competed in two events at the 1920 Summer Olympics."@en . "1968-05-18Z"^^ . "Tjabel Boonstra"@en . "1899-06-04Z"^^ . "Boonstra, Tjabel"@en . "1968Z"^^ . "Cyclist" . . .