Prev Next Category: Envelope Letter from Nielsen 1984-03-04 Mogens Otto Nielsen, Denmark Section: Mail Art Network Sent from: Hjallerup, Denmark Medium: Printed matter Category: Letter, CFP, Envelope Dimensions (cm): 12.5 x 16.5 Pages: 4 Subject: mogens otto nielsen, atmosphere controlled, mail art, thou-art, henryk gajewski, rod summers, pier van dijk, harm dirkse, stamp book, earth heart