Found 2 datasets matching "LDN".
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The AIOD is administered by Loudoun County. The boundaries are based on the Loudness Day Night (LDN) noise contours that were updated by the Metropolitan Area Airports Authority (MWAA) in 2019, as...
Search relevance: 69.43 | Views last month: 1 -
This catalog is an updated version of the original version of the Lynds' Catalog of Dark Nebulae that was published in 1962. The catalog was based on a study of the red and blue prints of the...
Search relevance: 41.94 | Views last month: 2
