http://nla.gov.au/nla.obj-133542995
Cronin, Bernard, 1884-1968. (193-?). Geological diagram showing time scale in millions of years as suggested by the investigation of radio active minerals, 1930s Retrieved September 28, 2023, from http://nla.gov.au/nla.obj-133542995
Cronin, Bernard, 1884-1968. Geological diagram showing time scale in millions of years as suggested by the investigation of radio active minerals, 1930s : , 193-?. Web. 28 September 2023 <http://nla.gov.au/nla.obj-133542995>
Cronin, Bernard, 1884-1968. 193-?, Geological diagram showing time scale in millions of years as suggested by the investigation of radio active minerals, 1930s , viewed 28 September 2023 http://nla.gov.au/nla.obj-133542995
{{Citation
| author1=Cronin, Bernard, 1884-1968.
| title=Geological diagram showing time scale in millions of years as suggested by the investigation of radio active minerals, 1930s
| year=193-?
| section=1 negative : glass, b&w ; 8.2 x 8.2 cm.
| series=Bernard Cronin collection of lantern slides, ca. 1920-1965
| publisher=
| url=http://nla.gov.au/nla.obj-133542995
| id=nla.obj-133542995
| access-date=28 September 2023
| via=Trove
}}
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