Becker, E. <br/><br/>
Theorie der mikrometer und der mikrometrischen messungen am himmel 
E. Becker                                                 
 - Breslau  Verlag Von Eduard Trewendt  1899 
 - vii, 185p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Astronomy and astrophysics thesaurus<br/>Instruments<br/>Optical instruments
<br/><br/><label>Universal Decimal Class. No.: </label>531.714  / BEC