The two pieces of information that would be most helpful for Luke's presentation on a dinosaur fossil dig are:
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A timeline of the dig's progress - This would provide valuable context about the stages of the dig and any significant findings along the way.
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A map of the dig site - This would help illustrate the location of the dig and where specific fossils were found, giving a visual understanding of the project's scope.
These two items would offer relevant and informative insights for his research project.