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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
The relation of concretions to coal seams
Jose Maria Feliciano
Kieselsäureanreicherungen in den oberjurassischen Sedimenten der Schwäbischen Alb
Martin Beurer
The pipy concretions of the Arikaree
C. Bertrand Schultz
Origin of marine oöids and grapestones
Frank H. Fabricius