A "design of the land" or landmap. Prior to becoming part of the United States, Mexico had established a land granting system for Alta California. It required the grantee to submit a "letter of request" accompanied by a diseño de terreno.
Diseño de terreno de la Misión Dolores (example) - San Francisco, Calif., District Court (California: Northern District). Land case 338. Year 1854. Contributing Institution: The Bancroft Library, University of California, Berkeley, CA.