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Asa Gray - Is it philosophical, is it quite allowable,...
Is it philosophical, is it quite allowable, to assume without evidence from fossil plants that the family or any of the genera was once larger and wide spread? and occupied a continuous area? (Asa Gray)

Is it philosophical, is it quite allowable, to assume without evidence from fossil plants that the family or any of the genera was once larger and wide spread? and occupied a continuous area?

Asa Gray

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allowable area evidence family fossil genus once quite spread wide

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