Wienert, K. A.  <br/><br/>
Notes on geomagnetic observatory and survey practice / 
K. A. Wienert 
 - Paris :  Unesco,    c 1970. 
 - 	217 p. :    ill. ;   24 cm. 
<br/><br/>67  67 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geomagnetic observatories.
<br/><br/><label>Dewey Class. No.: </label>551.16 / W636n