His collections of Chrysomelidae, Coccinellidae, Staphylinidae and Carabidae are in the Museum für Naturkunde in Berlin, and his collections of Cerambycidae and Coccinellidae are in the National Museum of Natural History, Washington, D.C..
Сегодня его значительная коллекция "Chrysomelidae" и "Coccinellidae", "Staphylinidae" и "Carabidae" хранится в Музее естествознания в Берлине.