Pedro Gruenholz

Colection

Horticulture and gardening exhibition in Basel
Switzerland
Stockalper Palace in Brig
Switzerland
Pisum sativum (pea)
Switzerland
Johann Konrad Kern, politician
Switzerland
Duderstadt Town Hall
Germany
Roman bracelet
Germany
10 Anniv.
Germany
50 Anniv.
Germany
Paul Wallot, Architect
Germany
Discovery of electromagnetic waves
Germany