I am searching for a way to obtain information on the adoption of a child born MARTHA PATZLOFF. She was adopted on May 15, 1918 by Charles William and Stella Alice (Kimbrell) Clark in Fairbury, Nebraska. The "Board of Commissioners of State Institutions of the State of Nebraska" and an agent by the name of Amy V. Stevens filed the petition, according to the Decree of Adoption.

How do I find out who Martha's birth parents are?