Het Spectrum published three different collections of SF-stories, all titled Science fiction verhalen.
1. One published in 1961 containing 16 stories, reprinted in 1962 and 1976; this last edition had : 16 korte sf-verhalen van o.m. Wyndham, Heinlein, Bradbury, Asimov, Dick en Clarke added to the title. ISBN of this edition is 9027408785.
2. One published in 1969; this is a hardcover edition containing 35 stories. No ISBN.
3. One published in 1976, which is a translation of Terry Carr's The Best Science Fiction of the Year #4. ISBN 9027408823.