Traité de Zoologie explained

The French: '''Traité de zoologie''' des éditions Masson, complete title French: '''Traité de zoologie, anatomie, systématique, biologie''' popularly known as French: le Grassé is a 52 volume synthesis of Zoology published between 1948 and 1979 originally under the direction of Pierre-Paul Grassé. A new edition commenced in 1980. The books were not published in order, and some promised parts are yet to appear. The books are written in the French language.

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