Title: A reference work without an index is seriously flawed.
Product review: I am astonished that a serious reference work such as this does not contain an index. If you want to read about the Ring Nebula and like me do not happen to have its Messier number memorized you have to look pege by page through the book to find it. Don't believe a reference work, no matter how good the material, can rate more than a star without an index.
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