SCIENTIFIC AMERICAN, December, 1921, from New York, New York (with color cover). This issue contains the following prints, articles, and/or ads: Comparison of the Leading Railroad Systems of the World; The 4,000-Pound Demolition Bomb; Leading Armies of the World; Abraham Lincoln and the Repeating Rifle; The Revival of the Monoplane; The Mechanism of the Pipe Organ; and many more interesting articles and ads. The issue is complete and is in good condition (see photos for additional details).  Also included is a nice color cover which is not often present.  The cover does have library stamps; otherwise good.