First was Osprey New Vanguard #31: The M47 and M48 Patton Tanks; I recall in my youth building a plastic model of one version of the Patton tank. Aside from that, there's not much to say. I can remember seeing news footage of Patton tanks in the Israeli Army, not much else. Eh.
Second was Osprey New Vanguard #137: Japanese Tanks 1939 – 45. The Japanese weren't exactly famed for their armored warfare; not like the Germans or the US Army General Patton. Thus, I knew little about their forces. This book fills in that data.