Rif Rosh HaShana 5b {Rosh haShana 21a}

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5b

{Rosh haShana 21a}
Rabbi Yochanan announced: In every place that the messengers sent in Nissan reached, but that the messengers sent in Tishri cannot reach, they must observe two days for the holidays; and they make this restriction for Nissan lest people would do in Tishri as in Nissan.

END PEREK ONE - arba'a rashei shanim

PEREK TWO - ra`uhu beit din. END PEREK TWO

PEREK THREE - kol haShofarot

Mishna:
Every kind of shofar may be used except those made of cow-horn, because they are called "horn" (qeren),