With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Julius Caesar did not cross the Channel and the Rhine.
text_B: The Mount Jasper Lithic Source is a prehistoric archaeological site in Berlin , New Hampshire .. Located on the slopes of Mount Jasper on the north side of the city , it includes one of the only known evidences of mining by pre-Contact Native Americans in the eastern United States .. The mountain is a source of rhyolite , apparently prized for its qualities in the manufacture of stone tools .. rhyolite. rhyolite. The site includes a mine shaft about 9 m deep , as well as workshops at the base and summit of the mountain .. The site was added to the National Register of Historic Places in 1992 .. National Register of Historic Places. National Register of Historic Places
not_related.