I found a two books which were published in 1952 and one that say 56-66 thousand an another 66-75 thousand in their descriptions. May I know what do they mean with thousands?
...and there are so many editions, presumably every year since they it was first published. I look no further than Rolleiflex 2.8F and Rolleicord Vb and may I know which of those editions cover these cameras.