Elm Tree Range Map
(Ulmus crassifolia)
Link: - Wikipedia - Ulmus crassifolia
Credit: Elbert L. Little, Jr., of the U.S.D.A., Forest Service
Allergic Grasses
Credit: Capital Concierge Allergy
Pollen Calendar Austin TX
Link: - Pollen Calendars [Of] North America
Credit: Lo, Bitz, Battisti, Hess
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