http://nla.gov.au/nla.obj-133136257
(1974). [Post office cancellation rubber stamp inscribed: First hydrogen ballon flight, Australia, 31/10/74] Retrieved January 28, 2023, from http://nla.gov.au/nla.obj-133136257
[Post office cancellation rubber stamp inscribed: First hydrogen ballon flight, Australia, 31/10/74] : , 1974. Web. 28 January 2023 <http://nla.gov.au/nla.obj-133136257>
1974, [Post office cancellation rubber stamp inscribed: First hydrogen ballon flight, Australia, 31/10/74] , viewed 28 January 2023 http://nla.gov.au/nla.obj-133136257
{{Citation
|
| title=[Post office cancellation rubber stamp inscribed: First hydrogen ballon flight, Australia, 31/10/74]
| year=1974
| section=1 rubber stamp ; 5.7 x 5.1 cm. approx.
| publisher=
| url=http://nla.gov.au/nla.obj-133136257
| id=nla.obj-133136257
| access-date=28 January 2023
| via=Trove
}}
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