The use of added erbium filtration in intraoral radiography von Ponce, Arthur Z., McDavid, William D., Langland, Olaf E.

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Use of E-speed film with added filtration von Ponce, Arthur Z., McDavid, William D., Underhill, Thomas E., Morris, Charles R.

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Kodak T-Mat G film in rotational panoramic radiography von Ponce, Arthur Z., McDavid, William D., Lundeen, R.Curtis, Morris, Charles R.

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Adaptation of the Panorex II for use with rare earth screen-film combinations von Ponce, Arthur Z., McDavid, William D., Lundeen, R.Curtis, Morris, Charles R.

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The Changuinola peat deposit of northwestern Panama: a tropical, back-barrier, peat(coal)-forming environment von Cohen, Arthur D., Raymond, Robert, Ramirez, Arturo, Morales, Zorel, Ponce, Francisco

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The Changuinola peat deposit of northwestern Panama: a tropical, domed, back-barrier coal-forming environment von Cohen, A.D., Raymond, R., Ramirez, A., Morales, Z., Ponce, F.

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