Published Dec 1964 by Marvel.
1st printing. Captain America and Bucky guest star in "Fighting Side-By-Side With Captain America and Bucky!" This is the second solo Captain America crossover outside of the Avengers. Script by Stan Lee, pencils by Jack Kirby, inks by Dick Ayers. Kirby cover pencils. NOTE: 1994 JC Penney reprint exists. Can be identified by having a Bic ad on the back cover. Cover price $0.12.