Voyages extraordinaires
The works in this series included both fiction and non-fiction , some with overt science fiction elements ( e . g . , "Journey to the Center of the Earth" ) or elements of scientific romance ( e . g . , "Twenty Thousand Leagues Under the Sea" ) . 
<triplet> Journey to the Center of the Earth <subj> scientific romance <obj> genre <triplet> Twenty Thousand Leagues Under the Sea <subj> scientific romance <obj> genre