na INLIS000000000008785 Ind 0010-1118008785 Vlakke meetkunde KROOSHOF, G. G. Krooshof; A. Pakken Batavia J.B. Wolter 1939 108 p. ; 22 cm. 108 p. ; 22 cm. 511KROv Library has vol. I and III 511 MATHEMATICS 1173/73-mfn10564