An illustrated flora of the Northern United States, Canada and the British possessions
Britton, N.L. and Addison Brown
An illustrated flora of the Northern United States, Canada and the British possessions - - New York-USA New York Botanical Garden 1943 - v.3 - .
--Flora--USA--Canada--Colonias Britanicas--Gentianaceae--Compositae--
Botanica
An illustrated flora of the Northern United States, Canada and the British possessions - - New York-USA New York Botanical Garden 1943 - v.3 - .
--Flora--USA--Canada--Colonias Britanicas--Gentianaceae--Compositae--
Botanica