By I. J. FERGUSON-LEES and KENNETH WILLIAMSON T h e i t e m s here are largely unchecked reports, and m u s t not be regarded a s authenticated records. T h e y are selected, on the present w r i t e r s ' j u d g m e n t alone, f r o m s o u r c e s generally found to be reliable. Observers' n a m e s are usually o m i t t e d for r e a s o n s of s p a c e and in c a s e a report i s subsequently ...

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