WWF

WWF Collection, Fritz Hug

WWF Collection Fritz Hug,1968

WWF & Fritz Hug – Endangered animals – Helmhaus Zurich, Fritz Hug

SOLD WWF & Fritz Hug – Endangered animals – Helmhaus Zurich Fritz Hug,1970

WWF, Fritz Hug

WWF Fritz Hug,1972

WWF Switzerland – Wildlife Protection –, Claude Kuhn

WWF Switzerland – Wildlife Protection – Claude Kuhn,1992

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