BiblioVault may have an electronic file which would meet your requirements for this title:
Political Essay on the Kingdom of New Spain, Volume 2: A Critical Edition
Alexander von Humboldt, Vera M. Kutzinski, Ottmar Ette, Vera M. Kutzinski and Ottmar Ette
Cloth: 978-0-226-65155-2
Electronic: 978-0-226-65169-9