The power of limits : Proportional harmonies in nature, art, and architecture

The book of signs : Which contains all manner of symbols used from the earliest times to the middle ages by primitive peoples and Early christians

The story of the Rose

Die Pflanzen im Zauberglauben : Ein Katechismus der Zauberbotanik mit einem Anhange über Pflanzen-Symbolik

De plant in het volksgeloof : Tekst, teekeningen en omslag-linoleumsnede door Han Alta

The Genus capparis (Capparaceae) from the Indus to the Pacific