petroleum refining
preferred label: پالایش نفت @fa
type: Concept
narrower: oil sand refining

oil sand
preferred label: ماسه نفت‌دار @fa
type: Concept
related: oil sand refining

oil sand refining
related: oil sand
broader: petroleum refining
preferred label: پالایش ماسه نفت‌دار @fa
type: Concept