In a Position to Know
C. Coles Phillips
Feind hört mit!
Karl Hans Richard Zoozmann
International Agent Car
Unknown
Achtung Spione Vorsicht bei Gesprächen!
Theo Matejko
Spying with the Telescope
Maud & Miska Petersham
A spy ends his day with a Firing Squad
AP photograph
Camp Scene Majun Spies on his beloved Layla
Unknown
Cdv Kit Carson & Spy Lafayette
C. Baker
Alexandria, Virginia. The Marshall house, King & Pitt Streets
City Point, Virginia. Scouts at Secret Service headquarters
Antietam, Md. Allan Pinkerton, President Lincoln, and Maj. Gen John A. McClernand #1
City Point, Virginia. Secret Service headquarters
Pinkerton men
James F. Gibson
He's Watching You
Glenn Grohe
Alexandria, Virginia. Marshall house
Quaker lady detaining the English general
Unknown
A Merry Christmas #5
Unknown
Lincoln meets with Detective Pinkerton
Alexander Gardner
Commandant Targe Speaks to Journalists
Unknown
Hail Mary Walker, winner of the Congressional Medal of Honor
Matthew Brady
Misinformers
Matthew Brady
And he said I was the only girl he ever loved
Paul Stahr
Keep Mum - The World Has Ears
Edward T. Grigware
Commandant Dreyfus Exits the Building
Unknown
Maj. Allan Pinkerton, Secret Service Department and friends
Scouts and guides of the Army of the Potomac
The Mediator (Abe Lincoln)
Alexander Gardner
Secret Service
James F. Gibson
Shipper, Detective, Physician & soldier
Alexander Gardner
After the Return of Decorations
Unknown
The Mystery of the Missing Refugee
Eric Parker
The Baker's Dame
Petersham
Don't Kill Her Daddy
Dorothy Hope Smith
Interior of Castle Thunder, Petersburg, Va
Matthew Brady
Spion am Werk
Joseph Fenneker
The Eyes of the Army
Unknown
Science Fiction Quarterly: One of Them?
Ed Emshwiller
Bulldog Drummond #1
Unknown
Maulwurfe
Joseph Fenneker
African Americans as Scouts
Frank Leslie
Spy in Chief; Pinkerton
Alexander Gardner
Spy Liner
Hugh Joseph Ward
Sordid French Cavalry spies Plane
Keystone View Company
He Soon Spied the Hook and Poked it with His Nose
Luxor Price
Teacher or Father spies ships in the harbor with children
Charles Butler
Corps of Engineers and the Mexican Spy Company, 1847
Unknown