Seth books, by Jane Roberts
cal. 470 (260 - 470)
Depends on the book. Roberts seems to have become a clearer channel over time.
The Seth Material (1970), cal. 260
The Nature of Personal Reality (1974), cal. 300
The "Unknown" Reality Vol. 1. (1977), cal. 460
The "Unknown" Reality Vol. 2 (1979), cal. 470