Matches in DBpedia 2014 for { ?s ?p <http://dbpedia.org/resource/Category:United_States_Naval_Observatory> . }
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- American_Ephemeris_and_Nautical_Almanac subject Category:United_States_Naval_Observatory.
- Astronomical_Almanac subject Category:United_States_Naval_Observatory.
- Naval_Observatory_Vector_Astrometry_Subroutines subject Category:United_States_Naval_Observatory.
- Navy_Precision_Optical_Interferometer subject Category:United_States_Naval_Observatory.
- The_Nautical_Almanac subject Category:United_States_Naval_Observatory.
- United_States_Naval_Observatory subject Category:United_States_Naval_Observatory.
- United_States_Naval_Observatory_Flagstaff_Station subject Category:United_States_Naval_Observatory.