- Boston (Mass.), Department of Parks
- Digital Commonwealth
- Arnold Arboretum Horticultural Library
City of Boston. Parks Department.
- Arnold Arboretum
- (c) President and Fellows of Harvard College. Arnold Arboretum Archives. Permission to publish archival materials and / or images in a publication, performance, or broadcast must first contact the library for permission . Our policies and forms for use of the library and archival materials can be accessed at http://arboretum.harvard.edu/library/services/. All rights reserved.