Two approvals, 1891 and 1921. Each is a Nihil Obstat from the censor and an Imprimatur from the archbishop.
Nihil Obstat: D. J. McMahon Censor Librorum
Imprimatur: + Michael Augustine Archbishop of New York New York, September 5, 1891
Nihil Obstat: Arthur J. Scanlan, S.T.D. Censor Librorum
Imprimatur: + Patrick J. Hayes, D.D. Archbishop of New York New York, June 29, 1921
An Explanation of the Baltimore Catechism of Christian Doctrine, Imprimatur 1