Vibration evaluation of aircraft propellers. 

 - [Washington, D.C.,  1970]. 
 - [1], i, 19, 8 p. :  ill. 
<br/><br/> [Jan. 29, 1970].  Cover title.  Distribution made by issuing office.  [Advisory circular] AC 20-66.  [Issued with perforations].  4to.  CRDP Program Historic Shelflist record. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Propellers, Aerial--Vibration.
<br/><br/><label>GPO Item No.: </label>0431-C-04 
<br/><br/><label>Gov. Doc. Class. No.: </label>TD 4.8:P 94