Terry Smyth wrote in 010131 MMD about a long Duo-Art article in
Harper's New Monthly magazine of 1922.  Images of the 4-page article
are now at the MMD Pictures site; see "Duo-Art Supplement in 1922
Harper's New Monthly" at  http://mmd.foxtail.com/Pictures/

Terry would like to locate the rest of the series, which he believes
ran in eight parts.  They've never been reprinted.

Robbie Rhodes