--vrR e po r t upon the Removal of Blossom Rock, in San l!'rancisco Harbor, 

--Al-California. 1870. By R. S. W i 11 i am so n, Major, Corps of Engineers, 
brevet Lieutenant Colonel, U. S. A. and W. H. He u e r, Lieutenant 
corps of Engineers. (11 'l'af.) 4. Washington 1871.