Here are two books that have some info on WW I armored cars:
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archive.org has "Prisoners of the Red Desert" on the crew of HMS Tara whose ship was sunk a U-boat and they were held prisoners by the Sessuni until they were rescued by a British armored car unit.
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"A Sentimetal Journey Memoirs 1917-1922 Victor Shklovsky the memoirs of a writer who served in a Russian Armored car unit during this period. I haven't read the book but on the amazon.com look inside it mentions a Lanchester cannon car.
A have managed to get Shklovsky's book :
Page 11 Lanchester cannon car in Petrograd area
" 13 Garford
" 14 Fiat armored cars
" 17 Austin
" 19 Kerensky's car a grey Locomobile (a US luxury car)
" 46 Kerensky offensive lanchester armored car
" 62 In Petrograd September had been 30 armored cars now 5 operational some have VSRSD painted in red on green painted vehicles VSRSD: All Russian Union of the Revolutionary Socialist Democracy
" 158 Ukraine Packard Germans capture
" 167Ukraine Locomobiles and Packards Germans capture taking back to Germany
195 Jeffery Ambulance