This is from the Osprey book Armored Units of the Russian Civil war White and Allied:
The two white Russian armored cars:
The one with the Black triangle in a yellow circle is the Don Cossacks car the Ataman Bogaevsky from a picture taken in Rostov on the Don in 1919. It was either supplied by them by the british or Denikin> It took part in the advance on Moscow with General A.G. Shkuro's 3rd Horse Corps and was lost sometime during the retreat to Novorossisl.
The other is United Russia and saw service with the White forces around Archangel