The Howard David lead is interesting -
In addition to the MORE FOLK STRUMS FOR GUITAR mentioned above,
he edited WORLD CLASSICS FOR THE GUITAR (1965, 1968) Herk Favilla
Publications (I guess this is associated with FAVILLA guitars, now
inactive).
As JUAN De GRECOS he wrote THE FLAMENCO GUITAR (Sam Fox, 1973).
I've also heard from one of his students that he was associated
with GATO NEGRO instrument string manufacturer, and moved to Spain
in 1965.
Anyone with knowledge or connections to any of these companies
might be able to locate Howard David if he is still around.
Anyone have any ideas on how to pursue these paths ????

Also thought I'd re-cap the JUNE BUGG recordings:
ONE album:
PALACE M/PST-757 HOOTENANNY FOLK FESTIVAL
Additional tracks NOT in Palace 757 in:
VERNON 522 DOMINIQUE
VERNON 523 JFK TRIBUTE
PALACE 769 JFK In The Summer of His Years

Best wishes, Thomas.