Pocket Folder of Silhouettes of Royal Observer Corps Primary List Aircraft, Issu 4 (Air Ministry Pamphlet 326K)
An Air Ministry pamphlet, folding out to approximately 20 by 70cm, marked Restricted and coded 326K, issue 4, dated November 1957. 50 silhouettes of military aircraft, with an identification key on the reverse, with space for notes and official amendments. In very good, clean condition, with just the lightest of wear to cover.
