Here's a couple hundred books on the topic, most of which aren't readily available on amazon for some crazy reason.

https://mega.nz/#F!wKIhEa5S!4Y7jsNwtKp5kzOeJOPA_yw

Round numbers are made up. The more 0s at the end of the number the more likely they are made up. It makes sense to see round numbers in war torn Europe but there is no reason to see them in 1951.