| Description | 1 letter from J Brennan, City of Mexixo Republic of Mexico, to Edward A Bond, British Museum, London, UK about valuing some mineral samples. Annotation on letter: 11th Nov 1885. They are what they are said to be rose-garnet & [momlau-rock]: probably of no commercial value but [are (crossed out)] own opinion is of trifling importance. L.F |