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Authors whose works are in public domain in at least one jurisdiction

List of works by Francis W. Pennell

Plant lists : Chile, Colombia, Ecuador, and Peru ⬇️

Harvard University Botany Libraries

Plant lists : Colombia, Chile, Peru, and Brazil ⬇️

Harvard University Botany Libraries

The Scrophulariaceae of eastern temperate North America

monograph on Scrophulariaceae of eastern North America

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