I'm not sure exactly, but it probably had science - based stories and fantastical tales.
Since it was a 'Fantasy and Science Fiction' publication from March 1959, it most likely contained a diverse range of content. In terms of science fiction, it could have explored ideas such as time travel, which was a common theme in that era. There might have been stories set in dystopian futures, warning about the potential misuses of science. For fantasy, it could have delved into stories inspired by folklore and fairy tales, but with a modern twist. It might also have had some serial stories that kept the readers hooked from one issue to another, and perhaps some short stories that provided quick and interesting reads. There could have been some literary experiments in the form of unique narrative styles or characterizations within the stories as well.