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Lawrence S. Ritchie
,
Alfred Hernandez
, and
Ricardo Rosa-Amador
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Dale E. Wykoff
,
Lyman P. Frick
, and
Lawrence S. Ritchie
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Myron G. Radke
,
Lawrence S. Ritchie
, and
Frederick F. Ferguson
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Lawrence S. Ritchie
,
Luis A. Berrios-Duran
, and
Robert Deweese
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Wilda B. Knight
,
Lawrence S. Ritchie
,
Félix Liard
, and
Jorge Chiriboga
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Jorge Chiriboga
,
Lawrence S. Ritchie
,
José Oliver-González
,
Raymond Brown
, and
Víctor A. López
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