Barnard, J. G.  1815-1882. <br/><br/>
On the internal structure of the earth  considered as affecting the phenomena of precession and nutation, supplementary to article under the above head, Smithsonian contributions to knowledge, vol. XIX, no. 240 being the third of the problems of rotary motion. 
By J. G. Barnard. 
 - [Washington,  Smithsonian Institution,  1877] 
 - iii, 16 p.  diagrs.  33 cm. 
 - Smithsonian contributions to knowledge. [vol. XXIII, art. 4] Smithsonian Institution publication 310. .
<br/><br/><label>LCCN: </label>s  13000096  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Astronomy.<br/>Precession.<br/>Nutation.
<br/><br/><label>Subjects--Geographic Terms: </label><br/>Earth (Planet)--Internal structure.
<br/><br/><label>LC Class. No.: </label>Q11  / .S68 vol. 23