Material on Jan (Jacqaes) -Hans Groag, Emo's brother + Engelmann Paul & Groag Jacques students of Loos Adolf in Olomouc, written by Slapeta Vladimir for 77 birthday of Babler Otto

http://lod.ehri-project-test.eu/instantiations/il-002777-wp2_bt-080_000_000-080_000_090-eng an entity of type: Instantiation