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- Museum number:
- 3-14591
- Object class:
- Shell samples
- Collector:
- Edward W. Gifford
- Collection place:
- Shell midden on sand dune at Yavaros, Sonora, Mexico
- Collection date:
- January 29, 1953
- Taxon:
- Arca pacifica
- Museum number:
- 3-15060
- Object class:
- Shell samples
- Collector:
- Edward W. Gifford and William Egbert Schenck
- Collection place:
- Site 1 (Gifford), La Choyo beach, Sonora, Mexico
- Collection date:
- December 25, 1948
- Taxon:
- Arca pacifica
- Museum number:
- 3-15163
- Object class:
- Shell samples
- Collector:
- Edward W. Gifford and William Egbert Schenck
- Collection place:
- Dunes at beach near sloughs northeast of hills, La Choyo, Sonora, Mexico
- Collection date:
- December 29, 1948
- Taxon:
- Arca pacifica
- Museum number:
- 3-14603
- Object class:
- Shell samples
- Collector:
- Edward W. Gifford
- Collection place:
- Shell midden on hill road near Topolobampo, Sinaloa, Mexico
- Collection date:
- January 28, 1953
- Taxon:
- Arca pacifica