au.\*:("BROTZMAN NC")
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A TETRAHEDRAL MEGASPORE ARRANGEMENT IN A SEED FERN OVULE OF PENNSYLVANIAN AGESCHABILION JT; BROTZMAN NC.1979; AMER. J. BOT.; USA; DA. 1979; VOL. 66; NO 6; PP. 744-745; BIBL. 17 REF.Article