Image: UC Berkeley Environmental Design Library current exhibit ( Source : ENVI website) Today I received a copy of the Library at the University of California Berkeley magazine which featured the Tools of the Trade exhibit at the Environmental Design Library. The notice reminded me of a letter I wrote to the editor of Landscape Architecture Magazine about the writing and drawing tools used by landscape architect Thomas Balsley. Image: Landscape Architecture Magazine, April 2011 ( Source : Thomas Balsley Associates) Intrigued by the photographs of Thomas Balsley's hands -- which always held a pen -- in the April 2011 issue of Landscape Achitecture Magazine , I wrote the editor of LAM asking for information about the pens and markers that the landscape architect used in his practice. Here is an edited version of the response I received: Balsley tells us he uses Berol 314 graphite pencils for drafting and Spectracolor DESIGN or Berol Prismacolor for colored pencils. For f