Airworthiness approval of omega/VLF navigation, etc. 

 - [Washington, D.C.,  1988]. 
 - v. 
<br/><br/> Advisory circular 20-101C.  9/12/88.  CRDP Program Historic Shelflist record. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Electronics in navigation--Certification--United States.
<br/><br/><label>Gov. Doc. Class. No.: </label>TD 4.8/5:20-101 C