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- Museum number:
- 3-15160
- 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:
- Protothaca grata
- Museum number:
- 3-15290
- Object class:
- Shell samples
- Collector:
- Edward W. Gifford and William Egbert Schenck
- Collection place:
- Site 3 (Gifford), Northeast shore midden, Sonoyta River lagoon, Sonora
- Collection date:
- December 23, 1948
- Taxon:
- Protothaca grata
- Museum number:
- 3-15075
- 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:
- Protothaca grata
- Museum number:
- 3-15270
- Object class:
- Shell samples
- Collector:
- Edward W. Gifford and William Egbert Schenck
- Collection place:
- Site 3 (Gifford), Northeast shore midden, Sonoyta River lagoon, Sonora
- Collection date:
- December 23, 1948
- Taxon:
- Protothaca grata
- Museum number:
- 3-14586
- 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:
- Protothaca grata
- Museum number:
- 3-15118
- 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:
- Protothaca grata
- Museum number:
- 3-15034
- 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:
- Protothaca grata