Boeshore, Irwin <br/><br/>
The morphological continuity of scrophulariaceae and orobanchaceae 

 - Philadelphia :   University of Pennsylvania,   1920. 
 -  car. ;   17 x 24 cm. 
<br/><br/> A thesis pres. to the fac. of the grad. sch. in part. fulf. of the req. for degr. of. Dr. of philosophy    University of Pennsylvania