Given the following passage  "Initial reactions to the novel were varied. The New Yorker declared it "skilled, unpretentious, and totally ingenious", and The Atlantic Monthly's reviewer rated it as "pleasant, undemanding reading", but found the narrative voice—"a six-year-old girl with the prose style of a well-educated adult"—to be implausible. Time magazine's 1960 review of the book states that it "teaches the reader an astonishing number of useful truths about little girls and about Southern life" and calls Scout Finch "the most appealing child since Carson McCullers' Frankie got left behind at the wedding". The Chicago Sunday Tribune noted the even-handed approach to the narration of the novel's events, writing: "This is in no way a sociological novel. It underlines no cause ... To Kill a Mockingbird is a novel of strong contemporary national significance."",  answer the following question. Note that the answer is present within the text.  Question: How did The Chicago Sunday Tribune react to the noveL?
To Kill a Mockingbird is a novel of strong contemporary national significance