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(). Optical square surveying instrument Retrieved June 7, 2023, from http://nla.gov.au/nla.obj-133550766
Optical square surveying instrument : , . Web. 7 June 2023 <http://nla.gov.au/nla.obj-133550766>
, Optical square surveying instrument , viewed 7 June 2023 http://nla.gov.au/nla.obj-133550766
{{Citation
|
| title=Optical square surveying instrument
| year=
| section=1 instrument.
| series=Pictures retrospective arrears not accessioned
| publisher=
| url=http://nla.gov.au/nla.obj-133550766
| id=nla.obj-133550766
| access-date=7 June 2023
| via=Trove
}}
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