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acer negundo pollen OR acer rubrum pollen OR acer saccharum polle... (13)
acer negundo pollen OR acer rubrum pollen OR acer saccharum pollen OR ailanthus altissima pollen OR betula nigra pollen OR betula papyrifera pollen OR betula pedula pollen OR carya illinoinensis pollen OR chenopodium album pollen OR eupatorium caprilli folium pollen OR fagus grandifolia pollen OR fraxinus american pollen OR juglans nigra pollen OR platanus occidentalis pollen OR populus deltoides pollen OR quercus alba pollen OR quercus rubra pollen OR quercus virginia a pollen OR salix nigra pollen OR solidago canadensis pollen OR ulmus americana pollen OR xanthium strumarium pollen
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