In the beginning, when I started with FTN books I had a hard time to distinguish Wim Crouwel his designs from the ones made by Daphne Duijveshoff. Later the differences became more clear to me. Duijvelshoff even had even more clean designs than Wim Crouwel had. Still, I sometimes make the error to think it is a Crouwel design I am looking at and to discover a few moments later that it is made by Daphne Duijvelshoff. They worked for a very long time together at Total design but she stopped with her design work in 2006. The excellent site on Dutch designers has done a special on her which can be found over here: https://www.dutchgraphicroots.nl/?p=2144
Of course http://www.ftn-books.com has some great Duijvelshoff designs available.