@prefix skos:	<http://www.w3.org/2004/02/skos/core#> .
@prefix isac:	<http://webisa.webdatacommons.org/concept/> .
isac:_method_	skos:broader	isac:sampling_method_ .
isac:_sample_	skos:broader	isac:sampling_method_ .
isac:_student_	skos:broader	isac:sampling_method_ .
isac:_drilling_	skos:broader	isac:sampling_method_ .
isac:convenience_sampling_	skos:broader	isac:sampling_method_ .
<http://webisa.webdatacommons.org/concept/simple+random_sampling_>	skos:broader	isac:sampling_method_ .