Raven, Peter H. <br/><br/>
Plant systematics :  [theory and practice] / 
by Peter H. Raven [and] Thomas R.Mertens. 
 - [Boston :  Heath,  c1965] 
 - American Institute of Biological Sciences. Biological sciences curriculum study. BSCS pamphlets no. 23 .
<br/><br/> Cover title. 
<br/><br/>Bibliography: p. 36. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Botany -- Classification.--Botany -- Classification.