The Applications for Enrollment of Chickasaw Newborn, Act of 1905, are found in National Archive film M-1301, Rolls 455-458, under the heading of Applications for Enrollment of the Commission to the Five Civilized Tribes. These applications contain considerably more information than stated on the census cards found in series M-1186.
The governing 1905 statute (H.R. 17474) defined Chickasaw Newborn as "infant children born prior to September twenty-fifth,...