City of Allentown, Parks Department - Lehigh Co.
F.A. Bartlett Tree Expert Company - Philadelphia Co.
Al Cherry Tree Service, Inc. - Montgomery Co.
Arborist Enterprises - Lancaster Co.
Fairmount Park Commission - Philadelphia Co.
Feeney’s Nursery - Bucks Co.
Fisher and Son Company, Inc. - Chester Co.
Lou Giroud Tree Service - Montgomery Co.
Haverford College - Delaware Co.
Hershey's Mill - Chester Co.
Keystone Tree Experts - Bucks Co.
Longwood Gardens - Chester Co.
Morris Arboretum - Philadelphia Co.
City of Newark, Parks Department. - New Castle Co., DE
The Pennsylvania Horticultural Society - Philadelphia Co.
Swarthmore College - Delaware Co.
Temple University, Depart. of LA/Horticulture - Montgomery Co.
Walters Nursery, Inc. - Bucks Co.
John B. Ward Tree Company, Inc. - Montgomery Co.
Westdell Landscape Group - Chester Co.