"Citrus" . . . . "From 40 to 55 million years ago" . . "Eocene mollusks from Citrus and Levy counties, Florida" . "Eocene mollusks from Citrus and Levy counties, Florida"@en . . . . . . . . . . . . . . . . . . . "Study of the unusual association of upper Eocene mollusk shells discovered in Citrus and Levy counties, Florida." . . . "Levy" . .