629.1325 B Blackburn, Elbert F Basic air navigation, 1st ed. New York and London, McGraw-Hill, 1944. vii, 300 p. ilus. tablas. diagrs. 23 cm <a id= "rdfa" about="http://bnjm.sld.cu/cgi-bin/item.py?idficha=bcuhcgrlyfof0220028" property = "oa:link" href="http://www.worldcat.org/oclc/ 610377814 ">WorldCat</a>