The Tri-Met System of Aerial Charting: A Working Manual for the Tri-Metrogon Process (Restricted) By Sixth Photographic Squadron (compilation) Books / Paperback Books Publisher: Army Air Forces, Price Starting at $37.58 Free Shipping Send to a friend Add to Wishlist Below is a list of products arranged by condition. Select the quantity of the product you desire and click the "Add" button. Used - Good Good condition. Lower corner curled. (aerial topographic photography, mapping) $37.58 1 in Stock at Warehouse Quantity Add Free Shipping to continental U.S. OR $1.00 per item discount if shipped to store. Reviews Goodreads reviews for The Tri-Met System of Aerial Charting: A Working Manual for the Tri-Metrogon Process (Restricted) There are not any review yet for this book