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NOTES FROM NCAS EDITORS:
The term "passim" after a range of pages means "scattered"; that is, the
indexed item is referred to in a number of places in the page range, with
gaps of various extent between successive references.
The large number of entries under "Radar" and "Sightings", and the
possibility of confusion due to multiple indent levels of sub-entries, led
us to create separate sections for those topics. They appear at the
appropriate alphabetic locations.