Pogson, Morman R. <br/><br/>
Telegraphic determinations of the difference of a longitude / 
By Norman R. Pogson 
 - Madras :  Lawrence Asylum Press,  1884 
 - 82 p. ;  26 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Electronic mail systems--Evaluation<br/>Wireless communication systems