The albums are: 

Blues, Songs and Ballads 
Merrimack County 
Ladies Love Outlaws 
The Circle Game (both 40th anniversary expanded remaster and original release) 
Tom Rush (both remaster and original release) 
Wrong End of the Rainbow 


The remastered expanded version of the Circle Game in particular is quite rare and commands a $50+ on the used market. It sounds MUCH better than the original release with less hiss, more clarity, deeper tighter bass and really rich, clear vocals