Occultations visible in the United States during the year 1851. 
Computed by John Downes, at the expense of the fund appropriated by Congress for the establishment of a Nautical almanac, and published by the Smithsonian Institution. 
 - Washington  [Smithsonian Institution]  1850. 
 - 24 p.  32 cm. 
 - Smithsonian contributions to knowledge,  vol. II, app. 4 Smithsonian Institution publication 11. .
<br/><br/><label>LCCN: </label>s  13000012  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Occultations.
<br/><br/><label>LC Class. No.: </label>Q11  / .S68