Have you used the mobile WSP Eco Map of the trees and historic Minetta Creek of Washington Square Park? There's nothing to download. Simply go to www.wspecoprojects.org to use the map. The map includes almost all of the trees growing in the park. To come: locations of the nesting boxes and trees with ID tags and memorial plaques.
P.S. The Eco Map was written about at WSP Blog, Curbed NY, and 6sqft.