"Menace of the Reverse Flash!"
Reprinted from Flash (1959) #139.
"Journey into Danger!"
Jay Garrick and Joan Williams find themselves at the mercy of an evil scientist, who wants Jay's help in perfecting his plant growth serum. This is an unpublished story from the 1940's.
"The Race to Thunder Hill!"
Reprinted from Flash (1959) #116
"Too Many Speed Kings"
Reprinted from Adventure Comics #189.
Note: This issue is G-82, G-81 was Adventure Comics #403 and G-83 is Superboy #174.