Matches in DBpedia 2014 for { ?s ?p <http://dbpedia.org/resource/Category:Protected_areas_established_in_1923> . }
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- Allegheny_National_Forest subject Category:Protected_areas_established_in_1923.
- Appalachian_Trail subject Category:Protected_areas_established_in_1923.
- Arrow_Rock_State_Historic_Site subject Category:Protected_areas_established_in_1923.
- Aztec_Ruins_National_Monument subject Category:Protected_areas_established_in_1923.
- Bennett_Spring_State_Park subject Category:Protected_areas_established_in_1923.
- Bryce_Canyon_National_Monument subject Category:Protected_areas_established_in_1923.
- Campbell_Falls_State_Park_Reserve subject Category:Protected_areas_established_in_1923.
- Carlsbad_Cave_National_Monument subject Category:Protected_areas_established_in_1923.
- Hopewell_Culture_National_Historical_Park subject Category:Protected_areas_established_in_1923.
- Hovenweep_National_Monument subject Category:Protected_areas_established_in_1923.
- Lake_Bemidji_State_Park subject Category:Protected_areas_established_in_1923.
- Mound_City_Group_National_Monument subject Category:Protected_areas_established_in_1923.
- National_Petroleum_Reserve–Alaska subject Category:Protected_areas_established_in_1923.
- Petit_Jean_State_Park subject Category:Protected_areas_established_in_1923.
- Pipe_Spring_National_Monument subject Category:Protected_areas_established_in_1923.
- Tully_Gorge_National_Park subject Category:Protected_areas_established_in_1923.
- Tunxis_State_Forest subject Category:Protected_areas_established_in_1923.