Weekly Shonen Jump #526

When was Weekly Shōnen Jump #526 published?

Weekly Shōnen Jump #526 has a cover date of January 25, 1979 (it went on sale earlier, on December 27, 1978), published by Shueisha in Japan.

Which manga series were featured in Weekly Shōnen Jump #526?

Weekly Shōnen Jump #526 (cover-dated January 25, 1979) featured Wonder Island 2, among other ongoing serializations.