Statistics for occurrence #1 of “Captain George W. Magruder” in chapter 2 of Daniel Ammen, Confederate Military History, a library of Confederate States Military History: Volume 7.2, The Atlantic Coast:

... At that date the chiefs of Bureaus were as follows: Of Yards and Docks, Captain Joseph Smith; of Construction, John Lenthal; of Provisions and Clothing, Horatio Bridge; of Ordnance and Hydrography, Captain George W. Magruder ; of Medicine, Surgeon William Whelan. These officers had been incumbents for years, and remained throughout the Civil War, with the exception of Captain Magruder, a Virginian, who remained in offi...
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