Six hard-bound collections of comic strip story arcs created by Al Williamson and Archie Goodwin (the first five volumes) and George Evans. The years covered in each volume are:
Vol. 1 - 1967 - 1969
Vol. 2 - 1969 - 1972
Vol. 3 - 1972 - 1974
Vol. 4 - 1974 - 1977
Vol. 5 - 1977 - 1980
Vol. 6 - 1980 - 1982