house ad for Superboy (DC, 1949 series) #156 [80 Page Giant #G-59], on sale March 6
The fifth page and the last page are 2/3-pages.
house ad for Adventure Comics (DC, 1938 series) #380, on sale March 27
house ad for Showcase (DC, 1956 series) #82, on sale March 13
house ad for Detective Comics (DC, 1937 series) #387 (Batman's 30th Anniversary)