http://nla.gov.au/nla.obj-133543025
Cronin, Bernard, 1884-1968. (193-?). Geological fossil diagram, fig 266 Graptolites, Ordovician and Silurian species, 1930s Retrieved June 20, 2025, from http://nla.gov.au/nla.obj-133543025
Cronin, Bernard, 1884-1968. Geological fossil diagram, fig 266 Graptolites, Ordovician and Silurian species, 1930s : , 193-?. Web. 20 June 2025 <http://nla.gov.au/nla.obj-133543025>
Cronin, Bernard, 1884-1968. 193-?, Geological fossil diagram, fig 266 Graptolites, Ordovician and Silurian species, 1930s , viewed 20 June 2025 http://nla.gov.au/nla.obj-133543025
{{Citation
| author1=Cronin, Bernard, 1884-1968.
| title=Geological fossil diagram, fig 266 Graptolites, Ordovician and Silurian species, 1930s
| year=193-?
| section=1 slide : glass, lantern, 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-133543025
| id=nla.obj-133543025
| access-date=20 June 2025
| via=Trove
}}
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