WHICH IS IT?

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In LaFleche's Osage Dicionary and Mark S's Omaha Lexicon, both use Dorsey "c" with a cedilla.
LaFleche's phonetic key has reads:  "C (+ cedilla)  as in thin" 
Mark's pronunciation guide has:  "C (+ cedilla) sounds like s in the word say." 

Which way is it? Are they both correct?
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