Bell, Peter Robert. The diversity of green plants - 2 ed. - Baltimore, Md. : University Park, 1975 - 374 p. : ilus. - A series of student texts in contemporary biology . - A series of student texts in contemporary biology . LCCN: 14161 Subjects--Topical Terms: Botánica--Clasificación. Dewey Class. No.: 580.12 / B46 1975