Available now in the BOCN downloads section: U.S. Army Handbook of the Incendiary Drop Bomb Mark 1 and 2, 1918. This file is from SCRIBD, the scan is by the U.S. National Archives with good clear images.
http://www.bocn.co.uk/vbforum/downloads.php?do=file&id=520
Brian
http://www.bocn.co.uk/vbforum/downloads.php?do=file&id=520
Brian
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