William Joseph Cosens LANCASTER (M: 1851 May 28 - 1922 Jun 10) (ps: Harry COLLINGWOOD).
With grateful acknowledgements to the New General Catalogue of Old Books and Authors for the list below.

On the website

1. Under the Meteor Flag [f|1884]
2. The Pirate Island [f|1885]
3. The Congo Rovers [f|1886]
4. The Log of the ‘Flying Fish’ [f|1887]
5. The Rover’s Secret [f|1888]
6. The Missing Merchantman [f|1889]
7. The Cruise of the ‘Esmeralda’ [f|?]
8. The Pirate Slaver [f|1895]
9. For Treasure Bound [f|1897]
10. The Log of a Privateersman [f|1897]
11. A Pirate of the Caribbees [f|1898]
12. The Castaways [f|1899]
13. Across the Spanish Main [f|1906]
14. With Airship and Submarine [f|1908]
15. A Middy in Command [f|1909]
16. Under the Chilian Flag [f|1909]
17. Harry Escombe [f|1910]
18. The Cruise of the ‘Thetis’ [f|1910]
19. Overdue [f|1911]
20. A Middy of the Slave Squadron [f|1911]
21. A Middy of the King [f|1912]
22. The Adventures of Dick Maitland [f|1912]
23. Two Gallant Sons of Devon [f|1913]
24. Turned Adrift [f|1913]
25. The Cruise of the ‘Nonsuch’, Buccaneer [f|1914]
26. The First Mate [f|1914]
27. Through Veld and Forest [f|1914]
28. A Pair of Adventurers in Search of El Dorado [f|1915]
29. A Chinese Command [f|1915]
30. The Strange Adventures of Eric Blackburn [f|1922]
31. The Wreck of the Andromeda [f|1923]

Not on the website

1. The Secret of the Sands [f|1879]
2. The Voyage of the Aurora [f|1885]
3. The Doctor of the ‘Juliet’ [f|1892]
4. Jack Beresford’s Yarn [f|1896]
5. The Homeward Voyage [f|1897]
6. An Ocean Chase [f|1898]
7. Dick Leslie’s Luck [f|1906]
8. Geoffrey Harrington’s Adventures [f|1907]
9. Blue and Grey [f|1908]
10. A Strange Cruise [f|1912]
11. Under the Ensign of the Rising Sun [f|1916]
12. The Cruise of the ‘Flying Fish’, the Airship-submarine [f|1924]
13. In the Power of the Enemy (w Percival LANCASTER) [f|1925]
14. The Harry Collingwood Omnibus Book [3v|s|1933]