The Library of the Arnold Arboretum
VI Series, Tafel 1 (The Oak) 
Tafel 2 (The Hazelnut)
Die Kulturgewächse der Heimat, VI Series, Tafel 1 (The Oak)
Die Kulturgewächse der Heimat, VI Series, Tafel 2 (The Hazelnut)
See HOLLIS record.
Additional Schlitzberger wall charts are in the Cryptogamic collection.