China Covers and Cancellations Air MailInternational To U.S.A., Incoming Maill: 1942 (12 Jan.) air mail envelope from Forest Green, Missouri to Chungking bearing 20c. (a second adhesive possibly missing) with Kunming (14.4) c.d.s., U.S. Embassy Chungking handstamp (16.4) and with censor seal at side. Returned to sender, the envelope bears Washington transit postmark (20.5) on the reverse. Unusual