au.\*:("PIERARD LH")
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APATITE PETRIFACTIONS IN PENNSYLVANIAN SHALES OF ILLINOIS.GLUSKOTER HJ; PIERARD LH; PFEFFERKORN HW et al.1970; J. SEDIMENT. PETROL.; USA; 1970(12), VOL. 40, NUM. 0004, P. 1363Miscellaneous