What does App Cas stand for?

Apeal Cases in the United States - A publication (SAUS)

Appeal Cases, District of Columbia - 1-74 - A publication (DLA)

Appeal Cases, English Law Reports - 1875-90 - A publication (DLA)

Appeal Cases in the United States - A publication (DLA)

Appeal Cases of the Different States - A publication (SAUS)

Law Reports, Appeal Cases - England - A publication (DLA)