Algiers AC Zone Data Reduced to ACRS
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https://b2find.eudat.eu/dataset/81f7f5b6-2018-57d0-a873-9012272e6f64
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资源简介：
The U.S. Naval Observatory is in the process of making new reductions of the Astrographic Catalogue (AC) using a modern reference system, the ACRS, which represents the system...
