@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix nalt: <https://lod.nal.usda.gov/nalt/> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix dc: <http://purl.org/dc/terms/> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix owl: <http://www.w3.org/2002/07/owl#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
@prefix ns0: <https://lod.nal.usda.gov/naltv#> .

<https://lod.nal.usda.gov/naltv#marc001> rdfs:label "Field 001 in MARC Authority Format"@en .
nalt:137077_def
  a <https://lod.nal.usda.gov/naltv#Definition> ;
  rdf:value "A research method in which investigators watch attentively to gather data without manipulation."@en, "Método de investigación en el cual los investigadores observan con atención para obtener los datos sin manipulación."@es ;
  dc:source "NAL Thesaurus Staff" .

<https://lod.nal.usda.gov/nalt>
  a skos:ConceptScheme ;
  rdfs:label "NALT Full"@en .

<https://lod.nal.usda.gov/naltv#Topic>
  a owl:Class ;
  rdfs:label "Topic"@en .

nalt:137077
  a <https://lod.nal.usda.gov/naltv#Topic>, skos:Concept ;
  dc:created "2010-09-01"^^xsd:date ;
  dc:modified "2020-07-16"^^xsd:date ;
  dc:source "Joint Institute for Food Safety and Applied Nutrition (JIFSAN)" ;
  skos:broader nalt:9146 ;
  skos:definition nalt:137077_def ;
  skos:exactMatch <http://id.agrisemantics.org/gacs/C23358> ;
  skos:inScheme <https://lod.nal.usda.gov/nalt-core>, <https://lod.nal.usda.gov/nalt> ;
  skos:narrower nalt:341427 ;
  skos:prefLabel "observational studies"@en, "estudios de observación"@es ;
  skos:related nalt:137085, nalt:137073 ;
  ns0:marc001 "59089" .

nalt:137085
  a ns0:Topic, skos:Concept ;
  skos:prefLabel "estudios prospectivos"@es, "prospective studies"@en ;
  skos:related nalt:137077 .

nalt:341427
  a ns0:Topic, skos:Concept ;
  skos:broader nalt:137077 ;
  skos:prefLabel "estudios ecológicos"@es, "ecological studies"@en .

nalt:137073
  a ns0:Topic, skos:Concept ;
  skos:prefLabel "estudios de caso y control"@es, "case-control studies"@en ;
  skos:related nalt:137077 .

nalt:9146
  a ns0:Topic, skos:Concept ;
  skos:narrower nalt:137077 ;
  skos:prefLabel "métodos de investigación"@es, "research methods"@en .