Given that the following translation of the Code of Canon Law
The 1917 Code of Canon Law in English & Latin (2 vols.); By Edward N. Peters / 2 publishers / 1918–2001
is being developed pre-publication, it makes sense to also make available appropriate, Catholic Commentaries on the Code. Two such approved Commentaries (available in the public domain) are:
A Commentary on the New Code of the Canon Law (all volumes); Dom Charles Augustine Bachofen, O.S.B., D.D., 1872- . Published 1918-1922. St.Louis, Mo., B. Herder book Company, Imprimatur and Nihil Obstat.
https://archive.org/details/1917CodeOfCanonLawCommentary
Also:
The New Canon Law : A Commentary and Summary of the New Code of Canon Law; Woywod, Stanislaus. 1880-1941. Published 1918
https://archive.org/details/newcanonlaw00woywuoft