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Book dossier
by Martin Beurer
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Pyritic cone-in-cone concretions
Bertram G. Woodland
The nature and origin of cone-in-cone structure
Bertram G. Woodland
Origin and age of Fe-Mn-P concretions and nodules in an Oregon wetland
Scott R. Stewart
An organic origin for the carbonate concretions of the Ohio Shale
R. E. Criss
Concretions from the Champlain clays of the Connecticut Valley
J. M. Arms Sheldon
Calcareous concretions of the Omarolluk Formation, Belcher Islands, Northwest Territories
The relation of concretions to coal seams
Jose Maria Feliciano
The pipy concretions of the Arikaree
C. Bertrand Schultz
Origin of marine oöids and grapestones
Frank H. Fabricius