Harshberger John William

The Botanists Of Philadelphia And Their Work

The Vegetation Of The New Jersey Pine-Barrens: An Ecologic Investigation

Phytogeographic Survey Of North America: A Consideration Of The Phytogeography Of The North American Continent, Including Mexico, Central America And

The Vegetation Of The Yellowstone Hot Springs

Phytogeographic Survey Of North America

The Vegetation Of The New Jersey Pine-Barrens: An Ecologic Investigation