Quizá quiso decir: Documents ; 97. Collectanea ; 97. Documents ; 97. Patrick Moore's Practical Astronomy Series, 1431-9756 Applied Optimization, 1384-6485 ; 97 Studies in Risk and Uncertainty, 0926-972X ; 12 Patrick Moores Practical Astronomy Series, 1431-9756 International Series in Operations Research & Management Science, 0884-8289 ; 97 Patrick Moores Practical Astronomy Series, 1431-9756 PatrickMoores Practical Astronomy Series, 1431-9756 Patrick Moores Practical Astronomy Series, 1431-9756 Patrick Moores Practical Astronomy Series, 1431-9756 Patrick Moores Practical Astronomy Series, 1431-9756 PatrickMoores Practical Astronomy Series, 1431-9756 Patrick Moores Practical Astronomy Series, 1431-9756 Patrick Moores Practical Astronomy Series, 1431-9756 Patrick Moores Practical Astronomy Series, 1431-9756 Patrick Moores Practical Astronomy Series, 1431-9756 Patrick Moore's Practical Astronomy Series, 1431-9756 Patrick Moore's Practical Astronomy Series, 1431-9756