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The M-1918 155mm was a gun, not a howitzer. DMorpheus 20:35, 14 February 2006 (UTC) reply

From the text, it us unclear whether all the references listed (most of them technical manuals!) have been used to write the article; this is also complicated by the lack of inline citations. I'll assume that the main reference used has been the only book mentioned, so will move the rest to a "Further reading" section. And tag the article as "needing citations".
I'll also add other relevant books to "Further reading" as I identify them. Regards, DPdH ( talk) 04:02, 1 March 2014 (UTC) reply