Bobby:Della appears on two of ole Hoyt's albums:
1. A Rusty Old Halo, 1979 on Jeremiah 2. Hoyt Axton LIVE, 1981 also on Jeremiah.
Both are very hard to come by these days and very rare on CD -- however, you can try The Nashville Connection at 1-800-505-6685 for the second one listed above.
Good searchin'
Les