Archives de l'Institut de botanique, de la Station d'écologie végétale des Hautes-Fagnes et du Laboratoire du phytotron (I.R.S.I.A.)

Mode of access: Internet.

Der Teutsche Obstgärtner, oder, Gemeinnütziges Magazin des Obstbaues in Teutschlands sämmtlichen Kreisen

Mode of access: Internet.

American industry in Europe,

"Originally presented to the University of California in partial fulfillment of the requirements for the PH. D. degree."--Author's pref.