Handbook for the 4-inch BL Gun (Land Service)1904 available as a download at
https://ia902508.us.archive.org/31/...arksVAndV/HandbookOfThe4InchGunMarksVAndV.pdf
https://ia902508.us.archive.org/31/...arksVAndV/HandbookOfThe4InchGunMarksVAndV.pdf