![Cover of Paul Appell. Cours de mécanique rationnelle. - [Paris].](https://archive.org/services/img/ENS01_Ms0121_04)
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Paul Appell. Cours de mécanique rationnelle. - [Paris].
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Public-domain status shown for US. http://creativecommons.org/publicdomain/mark/1.0/
Public-domain status shown for US. http://creativecommons.org/publicdomain/mark/1.0/