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biostratigraphy
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View Bendigonian graptolites (Hemichordata) of Victoria By Barrie Rickards 
Bendigonian graptolites (Hemichordata) of Victoria
By Barrie Rickards
View Middle Jurassic (Bajocian and Bathonian) ammonites from northern Alaska By Ralph Willard Imlay
Middle Jurassic (Bajocian and Bathonian) ammonites from northern Alaska
Middle Jurassic (Bajocian and Bathonian) ammonites from northern Alaska
By Ralph Willard Imlay