This history of straight pins in the United States can be traced back to when pins were made by filing down single wires.
The Library Book, Book by Susan Orlean, Official Publisher Page
Under the Eagle: A Tale of Military Adventure and Reckless Heroism with the Roman Legions: 9780312304249: Scarrow, Simon: Books
Pin - Jewelry
#5: Straight talk about straight pins - Laura Sapelly
The Spymasters, Book by Chris Whipple, Official Publisher Page
Pin - Collectibles & Hobbies
Pin - Accessories
The History of the Straight Pin - Simple Simon and Company
The History of the Straight Pin - Simple Simon and Company