Some first printings of Adm. Hopwood's volumes of poetry-
The Secret of Ships, 64 pp., 1918 and reprints- Includes poems "The Secret of Ships, The King's Messengers, The Mystery Ships, The Freak, The Wardens, The Galleon, The Bo'sun's Mate, The Outlaw, HMS Vanguard, The Vale; 10 poems in all.

The Old Way and other poems, 1916, 1917 and later reprint, 64pp.,
includes "The Boatswain's Call, The Oaks of England, and five other naval poems.

The New Navy and Other Poems, 1919, 96pp., poems.

Navis, a Ship. Content not known, may not be poetry. Rare.

The poem,"Th Laws of the Navy," is on line at
Laws of the Navy

"....virtually unknown outside Anglo-American naval officers' circles,..."