51311. Inventory of the papers of Evert Willem Beth (1908-1964), philosopher, logician and mathematician 1920-1964 (c. 1980) / by P.J.M. Velthuys-Bechthold ; incorporating the finding-aid by J.C.A.P. Ribberink and P. van Ulsen. - Haarlem : Rijksarchief in Noord-Holland, 1995. 342 p. : ill., portr. : 30 cm.. - ((Inventarisreeks / Rijksarchief in Noord - Holland, ISSN 0927 - 7412 ; 4)). - Met bibliogr., lit.opg., reg. PK : DK1999-19

51311. Inventory of the papers of Evert Willem Beth (1908-1964), philosopher, logician and mathematician 1920-1964 (c. 1980) / by P.J.M. Velthuys-Bechthold ; incorporating the finding-aid by J.C.A.P. Ribberink and P. van Ulsen. - Haarlem : Rijksarchief in Noord-Holland, 1995. 342 p. : ill., portr. : 30 cm.. - ((Inventarisreeks / Rijksarchief in Noord - Holland, ISSN 0927 - 7412 ; 4)). - Met bibliogr., lit.opg., reg. PK : DK1999-19