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Abird conservation society has a database of every bird spotted by members in the past year. to make this data part of a gis would require tying each sighting to

Historians have recently discovered a historical journal published in the early twentieth century. the journal contains facts based on original sources about the downfall of the early byzantium empire. historians consider this long-lost journal to be a breakthrough in their understanding of the byzantium empire. based on this information, the journal is a source.

The louisianna purchase was controversil because