Materials mainly concerning exploration of California, including : Add. Ms. 13986 (Papers relating to Spanish possessions in America)*, vol. III - Extracto Historico de la Expedicion de Sonora ... (1769 expedition from Sonora to San Blas and San Diego). Another portion of Add. Ms. 13986 is in the Bolton Papers, Part I, no. 57; Add. Ms. 17574 (Mexico. Tratados varios), fol. 76-89 (State of the port of Monterey, 1770); Add. Ms. 17622 (Navegación del Mar del Sur), fol. 132-136 (Estéban José Martínez's voyage, 1788; Add. Ms. 20986 (Noticias Militares de America), fol. 54-58 (Description of diary of Portolá expedition, 1769) Maps and plans of a number of frontier presidios of New Spain from Add. Ms. 17622 also included.
