Recently online in the Internet Archive (Archive.org): Books about Spies and Intelligence

[MaureenE]

Some  recent additions to the Internet Archive.  The title/links have been copied, so I hope the underlying links work. Click on the titles. Sorry I have not been able to alter the size of the copied titles.
Spy and Counter-Spy. The Development of Modern Espionage [1928] by Rowan

The Story of Secret Service [1937] by Rowan

Spies of the Great War. Revelations of the Secret Service [1932] Woodhall

The Lunatic Spy [1935, British spy in Germany WW1] Groundsell

Naval

Strange Intelligence. Memoirs of Naval Secret Service [1931, British Navy WW1] Bywater and Ferraby. Most of the  unnamed spying in the book is supposed to have been carried out by Bywater.

Their Secret Purposes. Dramas and Mysteries of the Naval War [1932] Bywater

40 O.B. Or How the War was Won [1932, British Naval Intelligence] Hoy

French

On Special Missions [1927, French Secret Service] by Lucieto

Marthe Richard, the Skylark. The Foremost Woman Spy of France [1932] Ladoux

Shanghai on the Métro. Spies, Intrigue, and the French Between the Wars [1994] Miller

German

My Adventures as a German Secret Service Agent [1917] by Horst von der Golz

The Invisible Weapons [1932, a German spy in England] by Silber

Spies Break Through. Memoirs of a German Secret Service Officer [1934, Eastern (Russian) Front] by Bauermeister

Maureen