Red oak Quercus rubra Location: C & O canal, near Potomac, MD Year: 1983 Merckslides catalogue number: 05-21369 Comments:

Red oak Quercus rubra Location: C & O canal, near Potomac, MD Year: 2008 Merckdigitals catalogue number: 05-52906 Comments: Same tree as above.

Red oak Quercus rubra Location: Inner harbor, Baltimore, MD Year: 2009 Merckdigitals catalogue number: 05-72802 Comments:

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