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observational astronomy » observations astronomical
observational errors » observational methods, observational method, observational clues
operational concepts » computational concepts, foundational concepts, relational concept
observation concepts » observation concept, observational concepts, conservation concepts
observational astronomy » observations astronomical
observational errors » observational methods, observational method, observational clues
operational concepts » computational concepts, foundational concepts, relational concept
observation concepts » observation concept, observational concepts, conservation concepts
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