No, there is no English language book on Frenchrifles, let alone the Lebel. Doesn't make any sense to me either but I've been looking for 4 years and asking the fellows that have 500 different gun books at the shows. I know of THREE for Italian
Carcanos and at least one for Austrian Mannlichers and several for Arisakas.
There is however an excellent book on disassembly of nearly all military rifles.
"Military Rifle Disassembly and Re-assembly"
Has nearly anything I'm likely to encounter and has been well worth the $20 or so it costs.