Smithsonian Report. 1953 



ItS^^ISei 



1. Seedlings of white pine {Pinus strobus) invading thin grassland of poverty grass {Danthoiua 

 spicata) and Canada bluegrass {Poa compressa). Centre County, central Pennsylvania. 



2. Typical untreated mixed oak brush at right. At left, low vegetation two seasons 

 one selective basal spray. Power distribution line, shortleaf puie-hardwoods region, 

 oral Lee Experimental Forest, central Virginia. 



after 

 Fed- 



I 



