US Hawks Hang Gliding Association

A. Liwentaal
See also in literature:
Alexandre Liwentaal
Alexander Liwentaal
Albert Liwentaal
==============================================
At the borderline of hang gliding and primary gliding stands 1894 glider activity by Liwentaal (not to be confused with Lilienthal).

Start:

http://www.pionnair-ge.com/spip1/article.php3?id_article=11
and
http://www.pionnair-ge.com/spip1/spip.php?article114
and
http://www.pionnair-ge.com/spip1/spip.php?article11
and
http://www.pionnair-ge.com/spip1/spip.php?article113
and
https://et.wikipedia.org/wiki/Alexandre_Liwentaal

Special thanks to ARP -- Tony Prentice -- for the lead on someone seemingly missed somewhat in the flow of early gliding.