Unmapped For 3,000 Kilos

(from ebookjapan):
The title story depicts the adventures of Takeru, a boy explorer who will go to any dangerous place if he is hired. The title story is about the adventures of Takeru, a boy explorer who will go to any dangerous place as long as he is hired. "Aim! Saburota," in which he takes on a whale; "Father's Death," in which he avenges his father's death; "Search for the Dog!", where he's after a roaming robot dog, "Death of a Champion," in which a boxing champion's mysterious death is unraveled; "The Mystery of Sea Gull Island," in which a member of the International Secret Investigation Bureau is involved in an action; "Witness," in which a boy is mistaken for a witness and pursued; and seven other works depicting the adventures and struggles of boys!