"leermiddelen wiskunde vanaf 1981"@nl . "Th. van Bemmelen" . "Bemmelen, Th. van" . . _:B1377b1b1fd88a66da01b5ad58f91902e . . "van Bemmelen" . "Ook als: T. van Bemmelen" . "Th." . . _:B1377b1b1fd88a66da01b5ad58f91902e . _:B1377b1b1fd88a66da01b5ad58f91902e . _:B1377b1b1fd88a66da01b5ad58f91902e "2023-05-22"^^ . _:B1377b1b1fd88a66da01b5ad58f91902e . _:B1377b1b1fd88a66da01b5ad58f91902e . _:B1377b1b1fd88a66da01b5ad58f91902e "074920928" . _:B1377b1b1fd88a66da01b5ad58f91902e . _:B1377b1b1fd88a66da01b5ad58f91902e . _:B1377b1b1fd88a66da01b5ad58f91902e .