Catalogus van de Kunstveiling ... / Sotheby Mak van WaayThe collection of the late Hans Wetzlar, to be sold in Amsterdam on thursday June 9th 1977The B. de Geus van den Heuvel collection of Dutch and Flemish paintings, watercolours, drawings and etchings : to be sold by auction in Amsterdam at the round Lutheran church, Singel on Monday and Tuesday 26th-27th April 1976