AS A Great Plains native (K-State grad from Marion County, Kansas) who has reviewed about 15 prairie-related books the past decade, I believe your review of William Least Heat-Moon's Prairyerth (Book World, Oct. 13) by John Kenyon missed important aspects of the book. As a history professor, I believe he failed to focus on various unique points that Heat-Moon addressed that would be of particular interest to students of prairie ecosystems and various scientific elements of our American heritage. Contrary to Kenyon's views, I believe Heat-Moon's "moral aims" regarding the human impact on this unique environment were quite obvious for anyone who understands the changes to the prairie during the past century.