Matches in DBpedia 2014 for { ?s ?p <http://dbpedia.org/resource/Category:Protoplanetary_nebulae> . }
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- Boomerang_Nebula subject Category:Protoplanetary_nebulae.
- Calabash_Nebula subject Category:Protoplanetary_nebulae.
- Cotton_Candy_Nebula subject Category:Protoplanetary_nebulae.
- Egg_Nebula subject Category:Protoplanetary_nebulae.
- Frosty_Leo_Nebula subject Category:Protoplanetary_nebulae.
- HD_179821 subject Category:Protoplanetary_nebulae.
- IRAS_19475+3119 subject Category:Protoplanetary_nebulae.
- IRAS_23166+1655 subject Category:Protoplanetary_nebulae.
- List_of_protoplanetary_nebulae subject Category:Protoplanetary_nebulae.
- NGC_7027 subject Category:Protoplanetary_nebulae.
- Protoplanetary_nebula subject Category:Protoplanetary_nebulae.
- Red_Rectangle_Nebula subject Category:Protoplanetary_nebulae.
- Red_Square_Nebula subject Category:Protoplanetary_nebulae.
- Southern_Crab_Nebula subject Category:Protoplanetary_nebulae.
- Water_Lily_Nebula subject Category:Protoplanetary_nebulae.
- Westbrook_Nebula subject Category:Protoplanetary_nebulae.
- Category:Post-asymptotic-giant-branch_variable_stars broader Category:Protoplanetary_nebulae.