I'm not sure specifically which works by H Bruce Franklin are most notable in science fiction. But you can start by checking his bibliography in libraries or online bookstores. There might be some well - known works that are highly regarded in the science fiction community.
Since I don't have a definite list of his science fiction works at hand, you can also search for reviews and discussions about H Bruce Franklin in science fiction - related forums and groups. People there may share their experiences with his works, and based on those, you can look for the ones that seem most interesting to you.
Perhaps his works are less well - known to the general public but are important within academic circles regarding science fiction. You could try reaching out to science fiction scholars or enthusiasts who might be more familiar with his oeuvre. They may be able to recommend some of his more significant works, which could be based on unique concepts, innovative storytelling, or important contributions to the development of the genre.