1. Holyoke and Chelsea, MA urban tree canopy cover data, 1952-2014
			
			
			- Author(s):
 - Healy, Marc; Rogan, John; Roman, Lara A.; Nix, Sabine; Martin, Deborah G.; Geron, Nicholas
 
2. Philadelphia park tree cover data, 1959-2018
			
			
			- Author(s):
 - Nix, Sabine A.; Roman, Lara A.; Healy, Marc; Rogan, John; Pearsall, Hamil
 
	U.S. Department of Agriculture