ENMactra Ponderosa
Facsimile
Transcription
Status: Complete
Mactra Ponderosa, Conrad, Jour. Ac Nat Sc. vol 6 p 228 pl 10 f 5 Med; Ter Foss. p 25 pl 14 fig 1
[Typewritten Extract]
L. 4.3 H 3.4
Medial Tertiary
St. Mary's river Md.
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