HollyFrontier Corp 10-K/A

10-K/A

EX-31.1

EX-31.2

XBRL TAXONOMY EXTENSION SCHEMA

XBRL TAXONOMY EXTENSION CALCULATION LINKBASE

XBRL TAXONOMY EXTENSION DEFINITION LINKBASE

XBRL TAXONOMY EXTENSION LABEL LINKBASE

XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE

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