trying to contact ruth dunn lanham, possibly my sister, re: crash of donald dunn

i have been trying to email a response to ruth dunn lanham who is the daughter of donald l dunn who crashed in feb 1971 at phang rang afb. i have attempted a response by email but am not sure you have recieved any of them. if you are still out there let me know, possibly there is another email address i could try. thanks, michael jack dunn