WW2 Covers Censored In Canada And USA ?

At times due to the amount of mail sent from Canada and addressed to the USA only a proportion of the Mail was censored in Canada.

I have seen some of this uncensored Canadian mail censored once it had reached USA. I guess that uncensored mail attracted more attention from the US censors ?.

However I have not seen any mail censored in both Canada and the USA. Obviously I have seen only a very small sample. Does such double censored mail from Canada and addressed to the USA exist ? If so is it rare or relatively common.

AQ


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