Forgotten Weapon's Ian has been working on a book on French rifles and the book "Chassepot to FAMAS" is now up for pre-order on Kickstarter
https://www.kickstarter.com/projects/headstamp/chassepot-to-famas-french-military-rifles-1866-201
The Kickstarter campaign is already past the goal, but you can get in right now. The campaign goes until 5/31/2019