11. L'esperanto; conférence aux officiers de l'École Supérieure de Marine. Bourlet, C. (Carlo), 1866-1913 Paris, [Lib.] Hachette et Cie., 1907. Book Physical ReCAP 1231.32.155
12. Esperanto and labour / by the Executive Committee of B. L. E. S. British League of Esperantist Socialists. Executive Committee London : British League of Esperantist Socialists, 1923. Book Online
13. English-Esperanto dictionary, by Fleming Fulcher and Bernard Long. Fulcher, Fleming Rickmansworth, Eng., Esperanto Pub. Co., 1963 [1921] Book Physical ReCAP PM8237 .F8 1963 Loading...
14. Esperanto on wings / by Wilhelm Wingen ; translated from the German by Helene Wolff. Wingen, Wilhelm [place of publication not identified] : Helene Wolff, 1950. Book Physical ReCAP X54655688 Loading...
15. English-Esperanto Dictionary O'Connor, J. C. (John Charles), 1853-1928 Salt Lake City, UT : Project Gutenberg, Book Online
16. Dokumentoj de Esperanto : Informilo pri la historio kaj organizo de la Esperanta movado Möbusz, A. (Albin), 1871-1934 Salt Lake City, UT : Project Gutenberg, Book Online
17. Die Welthilfssprache Esperanto. Wagner, Hermann, Esperantist Stuttgart, Esperanto-Gruppe, 1946. Book Physical ReCAP 1231.31.55
18. Esperanto-English dictionary, by A. Motteau. Motteau, Achille, 1836-1906 London, 'Review of Reviews' Office, [1904?] Book Physical ReCAP KC 5359
19. Fundamento de Esperanto, gramatiko, ekzercaro, universala vortaro. Zamenhof, L. L. (Ludwik Lazar), 1859-1917 Paris, Hachette et cie; [etc., etc.] 1905. Book Physical ReCAP KC 1624
20. Internat͡sionalʹnyĭ i͡azyk esperanto = Esperanto Internacio Lingvo: hramatyka, format͡sii͡a do tvorenni͡a sliv i 50 li͡ekt͡siĭ / L.L. Zamenhof. Zamenhof, L. L. (Ludwik Lazar), 1859-1917 New York, N.Y. : Vydanni͡a "Holosu pravdy", 1921. Book Physical ReCAP PM8213 Z35 1921