The "Lancaster" Aircraft, Avro Type '683' Mk. II. Supplement No. 1 to Instructional Course Handbook. A.V.Roe & Co. Ltd. Manchester, Sep 1942. 8pp of text followed by 15 large foldouts, 6x9", card covers with sewn binding.. Covers changes to the Mk II aircraft from those of the Mk I. Stamped "Confidential" with owners name and address penned in title page. This is stamped Serial No. 191. About fair with cover soil and edge bumps, text block very good.