The Manual of the Botany of the Northern United States :
Gray, Asa, 1810-1888
The Manual of the Botany of the Northern United States : Including the District East of the Mississippi and North of North Carolina and Tennessee [electronic resource] / Asa Gray - Project Gutenberg, 2012 - Project Gutenberg 39423 .
Public domain in the USA.
Electronic text
The Manual of the Botany of the Northern United States : Including the District East of the Mississippi and North of North Carolina and Tennessee [electronic resource] / Asa Gray - Project Gutenberg, 2012 - Project Gutenberg 39423 .
Public domain in the USA.
Electronic text