Prev Next Category: Envelope Letter from Brög 1978-07-11 Hans Brög, West Germany Section: Mail Art Network Sent from: Cologne, West Germany Medium: Printed matter Category: Letter, CFP, Envelope Dimensions (cm): 29.7 x 21 Pages: 2 Subject: hans brog, black box, pawel petasz, positiv-negativ, thomas grünfeld, hermann sturm