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Robert van 't Hoff stair pole . Robert van 't Hoff Stair pole Material dimensions and location unknown From De Stijl vol Nr April Robert van 't Hoff Trappaal Ca Materiaal afmetingen en verblijfplaats onbekend Afkomstig uit De Stijl jaargang nr april lib uiowa edu htm Anonymous photographer AnonymousEU Robert van 't Hoff Illustrations