Barbara, I have two editions, the 1969 and the 1989. There is also a
1977 edition, I don't know if there are any later edtions. I got the 1989 when I realized that Michael had access to recipes mine lacked. I would recommend the 1989 edition also. It is updated quite a bit from the 1969 edition and it's also easier to get a nice copy. Mine was printed in 1993 and is in excellent condition. The 1969 edition is falling apart.
Edited to say I see Cathy gave you the exact name. The 1969 edition to avoid is called "Sunset Mexican Cook Book".