The images below appear to be an official copy of the 1849 Proclamation to the People of California announcing the formation of a Constitution. It is signed by Secretary of State Captain H.W. Halleck (his signature can be compared with his signature on this letter that he wrote to William Hartnell). How would this proclamation have been communicated to all the people in California? (There is a Spanish version also here - page 1 and here - page 2).
The above documents form part of the Vallejo Family Papers Collection reference BANC MSS C-B 441 at The Bancroft Library, University of California, Berkeley.