§ 1356. Investigations. The authority, and any member thereof, when directed by the authority, may make any investigation which the authority may deem necessary to enable it effectually to carry out the provisions of this act, and for that purpose the authority, or such member, may take and hear proofs and testimony and compel the attendance of witnesses and the production of books, papers, records and documents, including public records. The authority, and its authorized agents, may enter upon any lands as in its judgment may be necessary for the purpose of making surveys and examinations to accomplish any purpose authorized by this act, the authority being liable for actual damage done.