balloon mail
English
Noun
balloon
mail
(
uncountable
)
(
post
,
philately
)
The
transport
of
mail
, usually for weight reasons, in the form of a
postcard
carrying
the
name
of the
sender
by means of
an
unguided
hydrogen
or
helium balloon
.
See also
balloon mail
on Wikipedia.
Wikipedia
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. The text is licensed under
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