[South Florida DX Association] International Reply Coupons...

[Bill Marx]

Here are the regulations thanks to Sherri W4STB. Print it out and take it 
with you.
-Bill W2CQ

 http://pe.usps.gov/text/imm/immc3_007.html#npLZq39wats

 It is chapter 372 of the international mail manual

 This is found by going to usps.gov
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 International Mail Manual
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 International Reply coupons